diff --git a/docs/distributed-system/img/database-shard-method-1.png b/docs/distributed-system/img/database-shard-method-1.png
deleted file mode 100644
index 15462fb31..000000000
Binary files a/docs/distributed-system/img/database-shard-method-1.png and /dev/null differ
diff --git a/docs/distributed-system/img/database-shard-method-2.png b/docs/distributed-system/img/database-shard-method-2.png
deleted file mode 100644
index 13a2c7c03..000000000
Binary files a/docs/distributed-system/img/database-shard-method-2.png and /dev/null differ
diff --git a/docs/distributed-system/img/database-split-horizon.png b/docs/distributed-system/img/database-split-horizon.png
deleted file mode 100644
index b52603eee..000000000
Binary files a/docs/distributed-system/img/database-split-horizon.png and /dev/null differ
diff --git a/docs/distributed-system/img/database-split-vertically.png b/docs/distributed-system/img/database-split-vertically.png
deleted file mode 100644
index a35857fcf..000000000
Binary files a/docs/distributed-system/img/database-split-vertically.png and /dev/null differ
diff --git a/docs/distributed-system/img/es-cluster-0.png b/docs/distributed-system/img/es-cluster-0.png
deleted file mode 100644
index 934a0c95d..000000000
Binary files a/docs/distributed-system/img/es-cluster-0.png and /dev/null differ
diff --git a/docs/distributed-system/img/es-cluster.png b/docs/distributed-system/img/es-cluster.png
deleted file mode 100644
index 8b42eccec..000000000
Binary files a/docs/distributed-system/img/es-cluster.png and /dev/null differ
diff --git a/docs/distributed-system/img/es-index-type-mapping-document-field.png b/docs/distributed-system/img/es-index-type-mapping-document-field.png
deleted file mode 100644
index d0c8f422b..000000000
Binary files a/docs/distributed-system/img/es-index-type-mapping-document-field.png and /dev/null differ
diff --git a/docs/distributed-system/img/es-search-process.png b/docs/distributed-system/img/es-search-process.png
deleted file mode 100644
index 5f1c32901..000000000
Binary files a/docs/distributed-system/img/es-search-process.png and /dev/null differ
diff --git a/docs/distributed-system/img/es-write-detail.png b/docs/distributed-system/img/es-write-detail.png
deleted file mode 100644
index b5955ac2b..000000000
Binary files a/docs/distributed-system/img/es-write-detail.png and /dev/null differ
diff --git a/docs/distributed-system/img/es-write.png b/docs/distributed-system/img/es-write.png
deleted file mode 100644
index 93c2a9cf2..000000000
Binary files a/docs/distributed-system/img/es-write.png and /dev/null differ
diff --git a/docs/distributed-system/img/high-concurrency-system-design.png b/docs/distributed-system/img/high-concurrency-system-design.png
deleted file mode 100644
index 02a200370..000000000
Binary files a/docs/distributed-system/img/high-concurrency-system-design.png and /dev/null differ
diff --git a/docs/distributed-system/img/kafka-order-1.png b/docs/distributed-system/img/kafka-order-1.png
deleted file mode 100644
index 5f9cac4b1..000000000
Binary files a/docs/distributed-system/img/kafka-order-1.png and /dev/null differ
diff --git a/docs/distributed-system/img/kafka-order-2.png b/docs/distributed-system/img/kafka-order-2.png
deleted file mode 100644
index 9e974e7b4..000000000
Binary files a/docs/distributed-system/img/kafka-order-2.png and /dev/null differ
diff --git a/docs/distributed-system/img/mysql-master-slave.png b/docs/distributed-system/img/mysql-master-slave.png
deleted file mode 100644
index 9f12d4343..000000000
Binary files a/docs/distributed-system/img/mysql-master-slave.png and /dev/null differ
diff --git a/docs/distributed-system/img/rabbitmq-message-lose-solution.png b/docs/distributed-system/img/rabbitmq-message-lose-solution.png
deleted file mode 100644
index 284107def..000000000
Binary files a/docs/distributed-system/img/rabbitmq-message-lose-solution.png and /dev/null differ
diff --git a/docs/distributed-system/img/rabbitmq-message-lose.png b/docs/distributed-system/img/rabbitmq-message-lose.png
deleted file mode 100644
index 34c51be9d..000000000
Binary files a/docs/distributed-system/img/rabbitmq-message-lose.png and /dev/null differ
diff --git a/docs/distributed-system/img/rabbitmq-order-1.png b/docs/distributed-system/img/rabbitmq-order-1.png
deleted file mode 100644
index 8eeb105f1..000000000
Binary files a/docs/distributed-system/img/rabbitmq-order-1.png and /dev/null differ
diff --git a/docs/distributed-system/img/rabbitmq-order-2.png b/docs/distributed-system/img/rabbitmq-order-2.png
deleted file mode 100644
index 51c60b5cb..000000000
Binary files a/docs/distributed-system/img/rabbitmq-order-2.png and /dev/null differ
diff --git a/docs/distributed-system/img/redis-caching-avalanche-solution.png b/docs/distributed-system/img/redis-caching-avalanche-solution.png
deleted file mode 100644
index 975b41dd2..000000000
Binary files a/docs/distributed-system/img/redis-caching-avalanche-solution.png and /dev/null differ
diff --git a/docs/distributed-system/img/redis-caching-avalanche.png b/docs/distributed-system/img/redis-caching-avalanche.png
deleted file mode 100644
index 7f47b8e68..000000000
Binary files a/docs/distributed-system/img/redis-caching-avalanche.png and /dev/null differ
diff --git a/docs/distributed-system/img/redis-caching-penetration.png b/docs/distributed-system/img/redis-caching-penetration.png
deleted file mode 100644
index 036ffb6f2..000000000
Binary files a/docs/distributed-system/img/redis-caching-penetration.png and /dev/null differ
diff --git a/docs/distributed-system/img/redis-cluster-split-brain.png b/docs/distributed-system/img/redis-cluster-split-brain.png
deleted file mode 100644
index e9ffd5d04..000000000
Binary files a/docs/distributed-system/img/redis-cluster-split-brain.png and /dev/null differ
diff --git a/docs/distributed-system/img/redis-gossip.png b/docs/distributed-system/img/redis-gossip.png
deleted file mode 100644
index a5db6d7c2..000000000
Binary files a/docs/distributed-system/img/redis-gossip.png and /dev/null differ
diff --git a/docs/distributed-system/img/redis-junior-inconsistent.png b/docs/distributed-system/img/redis-junior-inconsistent.png
deleted file mode 100644
index 8aeac7a95..000000000
Binary files a/docs/distributed-system/img/redis-junior-inconsistent.png and /dev/null differ
diff --git a/docs/distributed-system/img/redis-master-slave-replication-detail.png b/docs/distributed-system/img/redis-master-slave-replication-detail.png
deleted file mode 100644
index 531489546..000000000
Binary files a/docs/distributed-system/img/redis-master-slave-replication-detail.png and /dev/null differ
diff --git a/docs/distributed-system/img/redis-master-slave-replication.png b/docs/distributed-system/img/redis-master-slave-replication.png
deleted file mode 100644
index 0a99b827d..000000000
Binary files a/docs/distributed-system/img/redis-master-slave-replication.png and /dev/null differ
diff --git a/docs/distributed-system/img/redis-master-slave.png b/docs/distributed-system/img/redis-master-slave.png
deleted file mode 100644
index dbffa3807..000000000
Binary files a/docs/distributed-system/img/redis-master-slave.png and /dev/null differ
diff --git a/docs/distributed-system/img/redis-redlock.png b/docs/distributed-system/img/redis-redlock.png
deleted file mode 100644
index d34d80491..000000000
Binary files a/docs/distributed-system/img/redis-redlock.png and /dev/null differ
diff --git a/docs/distributed-system/img/redis-single-thread-model.png b/docs/distributed-system/img/redis-single-thread-model.png
deleted file mode 100644
index 9be7f637f..000000000
Binary files a/docs/distributed-system/img/redis-single-thread-model.png and /dev/null differ
diff --git a/docs/high-availability/img/database-shard-method-1.png b/docs/high-availability/img/database-shard-method-1.png
deleted file mode 100644
index 15462fb31..000000000
Binary files a/docs/high-availability/img/database-shard-method-1.png and /dev/null differ
diff --git a/docs/high-availability/img/database-shard-method-2.png b/docs/high-availability/img/database-shard-method-2.png
deleted file mode 100644
index 13a2c7c03..000000000
Binary files a/docs/high-availability/img/database-shard-method-2.png and /dev/null differ
diff --git a/docs/high-availability/img/database-split-horizon.png b/docs/high-availability/img/database-split-horizon.png
deleted file mode 100644
index b52603eee..000000000
Binary files a/docs/high-availability/img/database-split-horizon.png and /dev/null differ
diff --git a/docs/high-availability/img/database-split-vertically.png b/docs/high-availability/img/database-split-vertically.png
deleted file mode 100644
index a35857fcf..000000000
Binary files a/docs/high-availability/img/database-split-vertically.png and /dev/null differ
diff --git a/docs/high-availability/img/es-cluster-0.png b/docs/high-availability/img/es-cluster-0.png
deleted file mode 100644
index cd906d195..000000000
Binary files a/docs/high-availability/img/es-cluster-0.png and /dev/null differ
diff --git a/docs/high-availability/img/es-cluster.png b/docs/high-availability/img/es-cluster.png
deleted file mode 100644
index 6f7ecaf75..000000000
Binary files a/docs/high-availability/img/es-cluster.png and /dev/null differ
diff --git a/docs/high-availability/img/es-index-type-mapping-document-field.png b/docs/high-availability/img/es-index-type-mapping-document-field.png
deleted file mode 100644
index 7eae792aa..000000000
Binary files a/docs/high-availability/img/es-index-type-mapping-document-field.png and /dev/null differ
diff --git a/docs/high-availability/img/es-search-process.png b/docs/high-availability/img/es-search-process.png
deleted file mode 100644
index 472b78789..000000000
Binary files a/docs/high-availability/img/es-search-process.png and /dev/null differ
diff --git a/docs/high-availability/img/es-write-detail.png b/docs/high-availability/img/es-write-detail.png
deleted file mode 100644
index 0a6968582..000000000
Binary files a/docs/high-availability/img/es-write-detail.png and /dev/null differ
diff --git a/docs/high-availability/img/es-write.png b/docs/high-availability/img/es-write.png
deleted file mode 100644
index 28e6b82dd..000000000
Binary files a/docs/high-availability/img/es-write.png and /dev/null differ
diff --git a/docs/high-availability/img/high-concurrency-system-design.png b/docs/high-availability/img/high-concurrency-system-design.png
deleted file mode 100644
index 8f79d84a4..000000000
Binary files a/docs/high-availability/img/high-concurrency-system-design.png and /dev/null differ
diff --git a/docs/high-availability/img/kafka-order-1.png b/docs/high-availability/img/kafka-order-1.png
deleted file mode 100644
index 67ab9455e..000000000
Binary files a/docs/high-availability/img/kafka-order-1.png and /dev/null differ
diff --git a/docs/high-availability/img/kafka-order-2.png b/docs/high-availability/img/kafka-order-2.png
deleted file mode 100644
index 0d82c116f..000000000
Binary files a/docs/high-availability/img/kafka-order-2.png and /dev/null differ
diff --git a/docs/high-availability/img/mysql-master-slave.png b/docs/high-availability/img/mysql-master-slave.png
deleted file mode 100644
index 6b519c675..000000000
Binary files a/docs/high-availability/img/mysql-master-slave.png and /dev/null differ
diff --git a/docs/high-availability/img/rabbitmq-message-lose-solution.png b/docs/high-availability/img/rabbitmq-message-lose-solution.png
deleted file mode 100644
index 9a1910dec..000000000
Binary files a/docs/high-availability/img/rabbitmq-message-lose-solution.png and /dev/null differ
diff --git a/docs/high-availability/img/rabbitmq-message-lose.png b/docs/high-availability/img/rabbitmq-message-lose.png
deleted file mode 100644
index 9a371def0..000000000
Binary files a/docs/high-availability/img/rabbitmq-message-lose.png and /dev/null differ
diff --git a/docs/high-availability/img/rabbitmq-order-1.png b/docs/high-availability/img/rabbitmq-order-1.png
deleted file mode 100644
index 7f2df3f84..000000000
Binary files a/docs/high-availability/img/rabbitmq-order-1.png and /dev/null differ
diff --git a/docs/high-availability/img/rabbitmq-order-2.png b/docs/high-availability/img/rabbitmq-order-2.png
deleted file mode 100644
index f5bba992c..000000000
Binary files a/docs/high-availability/img/rabbitmq-order-2.png and /dev/null differ
diff --git a/docs/high-availability/img/redis-caching-avalanche-solution.png b/docs/high-availability/img/redis-caching-avalanche-solution.png
deleted file mode 100644
index 4ebdf9a6c..000000000
Binary files a/docs/high-availability/img/redis-caching-avalanche-solution.png and /dev/null differ
diff --git a/docs/high-availability/img/redis-caching-avalanche.png b/docs/high-availability/img/redis-caching-avalanche.png
deleted file mode 100644
index 1aa7b48b1..000000000
Binary files a/docs/high-availability/img/redis-caching-avalanche.png and /dev/null differ
diff --git a/docs/high-availability/img/redis-caching-penetration.png b/docs/high-availability/img/redis-caching-penetration.png
deleted file mode 100644
index cdd5b0f0e..000000000
Binary files a/docs/high-availability/img/redis-caching-penetration.png and /dev/null differ
diff --git a/docs/high-availability/img/redis-cluster-split-brain.png b/docs/high-availability/img/redis-cluster-split-brain.png
deleted file mode 100644
index 886510381..000000000
Binary files a/docs/high-availability/img/redis-cluster-split-brain.png and /dev/null differ
diff --git a/docs/high-availability/img/redis-gossip.png b/docs/high-availability/img/redis-gossip.png
deleted file mode 100644
index 442a8a0eb..000000000
Binary files a/docs/high-availability/img/redis-gossip.png and /dev/null differ
diff --git a/docs/high-availability/img/redis-junior-inconsistent.png b/docs/high-availability/img/redis-junior-inconsistent.png
deleted file mode 100644
index d8b49536a..000000000
Binary files a/docs/high-availability/img/redis-junior-inconsistent.png and /dev/null differ
diff --git a/docs/high-availability/img/redis-master-slave-replication-detail.png b/docs/high-availability/img/redis-master-slave-replication-detail.png
deleted file mode 100644
index 6877e8ea5..000000000
Binary files a/docs/high-availability/img/redis-master-slave-replication-detail.png and /dev/null differ
diff --git a/docs/high-availability/img/redis-master-slave-replication.png b/docs/high-availability/img/redis-master-slave-replication.png
deleted file mode 100644
index d909d6bb4..000000000
Binary files a/docs/high-availability/img/redis-master-slave-replication.png and /dev/null differ
diff --git a/docs/high-availability/img/redis-master-slave.png b/docs/high-availability/img/redis-master-slave.png
deleted file mode 100644
index ea0b95b95..000000000
Binary files a/docs/high-availability/img/redis-master-slave.png and /dev/null differ
diff --git a/docs/high-availability/img/redis-redlock.png b/docs/high-availability/img/redis-redlock.png
deleted file mode 100644
index 1c72f9a4a..000000000
Binary files a/docs/high-availability/img/redis-redlock.png and /dev/null differ
diff --git a/docs/high-availability/img/redis-single-thread-model.png b/docs/high-availability/img/redis-single-thread-model.png
deleted file mode 100644
index 25736caab..000000000
Binary files a/docs/high-availability/img/redis-single-thread-model.png and /dev/null differ
diff --git a/docs/high-concurrency/kafka-order-01.png b/docs/high-concurrency/kafka-order-01.png
deleted file mode 100644
index 5b3ea7deb..000000000
Binary files a/docs/high-concurrency/kafka-order-01.png and /dev/null differ
diff --git a/docs/high-concurrency/kafka-order-02.png b/docs/high-concurrency/kafka-order-02.png
deleted file mode 100644
index 2159d54ad..000000000
Binary files a/docs/high-concurrency/kafka-order-02.png and /dev/null differ