diff --git a/model/类设计模型.png b/model/类设计模型.png
new file mode 100644
index 0000000..bae0c0c
Binary files /dev/null and b/model/类设计模型.png differ
diff --git a/model/顺序图.png b/model/顺序图.png
deleted file mode 100644
index f86fefa..0000000
Binary files a/model/顺序图.png and /dev/null differ