diff --git a/ppt/Lecture1.pptx b/ppt/Lecture1.pptx
deleted file mode 100644
index 94acf701..00000000
Binary files a/ppt/Lecture1.pptx and /dev/null differ
diff --git a/ppt/Lecture10.pptx b/ppt/Lecture10.pptx
deleted file mode 100644
index b7ba6a06..00000000
Binary files a/ppt/Lecture10.pptx and /dev/null differ
diff --git a/ppt/Lecture11.pptx b/ppt/Lecture11.pptx
deleted file mode 100644
index 1acc241f..00000000
Binary files a/ppt/Lecture11.pptx and /dev/null differ
diff --git a/ppt/Lecture12.pptx b/ppt/Lecture12.pptx
deleted file mode 100644
index 5785481f..00000000
Binary files a/ppt/Lecture12.pptx and /dev/null differ
diff --git a/ppt/Lecture13.pptx b/ppt/Lecture13.pptx
deleted file mode 100644
index 93db5f81..00000000
Binary files a/ppt/Lecture13.pptx and /dev/null differ
diff --git a/ppt/Lecture14.pptx b/ppt/Lecture14.pptx
deleted file mode 100644
index dc2bb6ee..00000000
Binary files a/ppt/Lecture14.pptx and /dev/null differ
diff --git a/ppt/Lecture15.pptx b/ppt/Lecture15.pptx
deleted file mode 100644
index 3ab106dd..00000000
Binary files a/ppt/Lecture15.pptx and /dev/null differ
diff --git a/ppt/Lecture16.pptx b/ppt/Lecture16.pptx
deleted file mode 100644
index 0a634080..00000000
Binary files a/ppt/Lecture16.pptx and /dev/null differ
diff --git a/ppt/Lecture17.pptx b/ppt/Lecture17.pptx
deleted file mode 100644
index faa5dbe5..00000000
Binary files a/ppt/Lecture17.pptx and /dev/null differ
diff --git a/ppt/Lecture18.pptx b/ppt/Lecture18.pptx
deleted file mode 100644
index 4434e8f1..00000000
Binary files a/ppt/Lecture18.pptx and /dev/null differ
diff --git a/ppt/Lecture2.pptx b/ppt/Lecture2.pptx
deleted file mode 100644
index 0c4fc8c4..00000000
Binary files a/ppt/Lecture2.pptx and /dev/null differ
diff --git a/ppt/Lecture3.pptx b/ppt/Lecture3.pptx
deleted file mode 100644
index 35a8cbda..00000000
Binary files a/ppt/Lecture3.pptx and /dev/null differ
diff --git a/ppt/Lecture4.pptx b/ppt/Lecture4.pptx
deleted file mode 100644
index 41a2f721..00000000
Binary files a/ppt/Lecture4.pptx and /dev/null differ
diff --git a/ppt/Lecture5.pptx b/ppt/Lecture5.pptx
deleted file mode 100644
index 4a5646cc..00000000
Binary files a/ppt/Lecture5.pptx and /dev/null differ
diff --git a/ppt/Lecture6.pptx b/ppt/Lecture6.pptx
deleted file mode 100644
index fffc5929..00000000
Binary files a/ppt/Lecture6.pptx and /dev/null differ
diff --git a/ppt/Lecture7.pptx b/ppt/Lecture7.pptx
deleted file mode 100644
index f7a10df4..00000000
Binary files a/ppt/Lecture7.pptx and /dev/null differ
diff --git a/ppt/Lecture8.pptx b/ppt/Lecture8.pptx
deleted file mode 100644
index 604d6139..00000000
Binary files a/ppt/Lecture8.pptx and /dev/null differ
diff --git a/ppt/Lecture9.pptx b/ppt/Lecture9.pptx
deleted file mode 100644
index f7434992..00000000
Binary files a/ppt/Lecture9.pptx and /dev/null differ
diff --git a/ppt/README.md b/ppt/README.md
deleted file mode 100644
index d99c335c..00000000
--- a/ppt/README.md
+++ /dev/null
@@ -1,3 +0,0 @@
-# **机器学习课程原版幻灯片**
-
-机器学习课程原版幻灯片。
\ No newline at end of file