diff --git a/q4/movies.json b/q4/movies.json
new file mode 100644
index 0000000..aca6aed
--- /dev/null
+++ b/q4/movies.json
@@ -0,0 +1,102 @@
+[
+    {
+        "id": 1,
+        "title": "泰坦尼克号",
+        "director": "Frank Darabont",
+        "year": 1994,
+        "rating": 9.1,
+        "duration": 150,
+        "genre": "剧情",
+        "actors_count": 2
+    },
+    {
+        "id": 2,
+        "title": "肖申克的救赎",
+        "director": "陈凯歌",
+        "year": 2004,
+        "rating": 7.8,
+        "duration": 180,
+        "genre": "剧情",
+        "actors_count": 2
+    },
+    {
+        "id": 3,
+        "title": "霸王别姬",
+        "director": "Robert Zemeckis",
+        "year": 2014,
+        "rating": 7.6,
+        "duration": 160,
+        "genre": "冒险",
+        "actors_count": 2
+    },
+    {
+        "id": 4,
+        "title": "忠犬八公的故事",
+        "director": "James Cameron",
+        "year": 1992,
+        "rating": 9.5,
+        "duration": 167,
+        "genre": "悬疑",
+        "actors_count": 5
+    },
+    {
+        "id": 5,
+        "title": "盗梦空间",
+        "director": "宫崎骏",
+        "year": 2014,
+        "rating": 8.2,
+        "duration": 176,
+        "genre": "喜剧",
+        "actors_count": 3
+    },
+    {
+        "id": 6,
+        "title": "阿甘正传",
+        "director": "Christopher Nolan",
+        "year": 2016,
+        "rating": 6.9,
+        "duration": 97,
+        "genre": "动画",
+        "actors_count": 2
+    },
+    {
+        "id": 7,
+        "title": "三傻大闹宝莱坞",
+        "director": "Lasse Hallström",
+        "year": 2003,
+        "rating": 7.0,
+        "duration": 122,
+        "genre": "悬疑",
+        "actors_count": 2
+    },
+    {
+        "id": 8,
+        "title": "放牛班的春天",
+        "director": "Rajkumar Hirani",
+        "year": 2021,
+        "rating": 8.7,
+        "duration": 140,
+        "genre": "喜剧",
+        "actors_count": 5
+    },
+    {
+        "id": 9,
+        "title": "星际穿越",
+        "director": "Christophe Barratier",
+        "year": 2002,
+        "rating": 9.0,
+        "duration": 125,
+        "genre": "冒险",
+        "actors_count": 5
+    },
+    {
+        "id": 10,
+        "title": "千与千寻",
+        "director": "Christopher Nolan",
+        "year": 2021,
+        "rating": 7.3,
+        "duration": 173,
+        "genre": "剧情",
+        "actors_count": 3
+    }
+]
\ No newline at end of file
diff --git a/q4/q4_1/movies.json b/q4/q4_1/movies.json
new file mode 100644
index 0000000..aca6aed
--- /dev/null
+++ b/q4/q4_1/movies.json
@@ -0,0 +1,102 @@
+[
+    {
+        "id": 1,
+        "title": "泰坦尼克号",
+        "director": "Frank Darabont",
+        "year": 1994,
+        "rating": 9.1,
+        "duration": 150,
+        "genre": "剧情",
+        "actors_count": 2
+    },
+    {
+        "id": 2,
+        "title": "肖申克的救赎",
+        "director": "陈凯歌",
+        "year": 2004,
+        "rating": 7.8,
+        "duration": 180,
+        "genre": "剧情",
+        "actors_count": 2
+    },
+    {
+        "id": 3,
+        "title": "霸王别姬",
+        "director": "Robert Zemeckis",
+        "year": 2014,
+        "rating": 7.6,
+        "duration": 160,
+        "genre": "冒险",
+        "actors_count": 2
+    },
+    {
+        "id": 4,
+        "title": "忠犬八公的故事",
+        "director": "James Cameron",
+        "year": 1992,
+        "rating": 9.5,
+        "duration": 167,
+        "genre": "悬疑",
+        "actors_count": 5
+    },
+    {
+        "id": 5,
+        "title": "盗梦空间",
+        "director": "宫崎骏",
+        "year": 2014,
+        "rating": 8.2,
+        "duration": 176,
+        "genre": "喜剧",
+        "actors_count": 3
+    },
+    {
+        "id": 6,
+        "title": "阿甘正传",
+        "director": "Christopher Nolan",
+        "year": 2016,
+        "rating": 6.9,
+        "duration": 97,
+        "genre": "动画",
+        "actors_count": 2
+    },
+    {
+        "id": 7,
+        "title": "三傻大闹宝莱坞",
+        "director": "Lasse Hallström",
+        "year": 2003,
+        "rating": 7.0,
+        "duration": 122,
+        "genre": "悬疑",
+        "actors_count": 2
+    },
+    {
+        "id": 8,
+        "title": "放牛班的春天",
+        "director": "Rajkumar Hirani",
+        "year": 2021,
+        "rating": 8.7,
+        "duration": 140,
+        "genre": "喜剧",
+        "actors_count": 5
+    },
+    {
+        "id": 9,
+        "title": "星际穿越",
+        "director": "Christophe Barratier",
+        "year": 2002,
+        "rating": 9.0,
+        "duration": 125,
+        "genre": "冒险",
+        "actors_count": 5
+    },
+    {
+        "id": 10,
+        "title": "千与千寻",
+        "director": "Christopher Nolan",
+        "year": 2021,
+        "rating": 7.3,
+        "duration": 173,
+        "genre": "剧情",
+        "actors_count": 3
+    }
+]
\ No newline at end of file
diff --git a/q4/q4_1/q4_1.py b/q4/q4_1/q4_1.py
index b8927e9..5c82852 100644
--- a/q4/q4_1/q4_1.py
+++ b/q4/q4_1/q4_1.py
@@ -1,6 +1,16 @@
 import matplotlib.pyplot as plt
 import json
-with open ("movies.json","r",encoding='utf-8') as f:
-   print(f)
-genre_count=()   
-plt.bar
\ No newline at end of file
+movies= json.load(open('movies.json',encoding='utf-8'))
+genres= {}
+for m in movies:
+   g=m['genre']
+   if g in genres:
+      genres['g'] = genres['g']+1
+   else:
+      genres['g']=1
+plt.figure(figsize=(8,5))
+plt.bar(genres.keys(),genres.values())
+plt.title("类型电影数量分布")
+plt.xlabel("类型")
+plt.ylabel("数量")
+plt.savefig('q4_1_bar.png', dpi=150)      
diff --git a/q4/q4_1/q4_1_bar.png b/q4/q4_1/q4_1_bar.png
new file mode 100644
index 0000000..81ecd2f
Binary files /dev/null and b/q4/q4_1/q4_1_bar.png differ
diff --git a/q4/q4_2/q4_2.py b/q4/q4_2/q4_2.py
new file mode 100644
index 0000000..a5309b6
--- /dev/null
+++ b/q4/q4_2/q4_2.py
@@ -0,0 +1,15 @@
+import matplotlib.pyplot as plt
+import json
+movies= json.load(open('movies.json',encoding='utf-8'))
+rating=[]
+durations=[]
+for m in movies:
+    rating.append(m['rating'])
+    durations.append(m['duration'])
+
+plt.figure(figsize=(8,5))
+plt.scatter(durations,rating,color='red',alpha=0.6)
+plt.title("时长与评分关系散点图")
+plt.xlabel('duration')
+plt.ylabel('rating')
+plt.savefig('q4_2_scatter.png',dpi=150)
diff --git a/q4/q4_2/q4_2_scatter.png b/q4/q4_2/q4_2_scatter.png
new file mode 100644
index 0000000..061b8ed
Binary files /dev/null and b/q4/q4_2/q4_2_scatter.png differ
diff --git a/q4/q4_3a/q4-3a.py b/q4/q4_3a/q4-3a.py
new file mode 100644
index 0000000..273225e
--- /dev/null
+++ b/q4/q4_3a/q4-3a.py
@@ -0,0 +1,14 @@
+import matplotlib.pyplot as plt
+import json
+movies= json.load(open('movies.json',encoding='utf-8'))
+rating=[]
+durations=[]
+for m in movies:
+    rating.append(m['rating'])
+    durations.append(m['duration'])
+plt.title("评分分布")        
+plt.xlabel("评分")    
+plt.figure(figsize=(8,5))
+plt.hist(rating,bins=5,color='blue')
+plt.savefig('q4_3a_hist.png',dpi=150)
+
diff --git a/q4/q4_3a/q4_3a_hist.png b/q4/q4_3a/q4_3a_hist.png
new file mode 100644
index 0000000..e19911e
Binary files /dev/null and b/q4/q4_3a/q4_3a_hist.png differ
diff --git a/q4/q4_3b/q4_3b.py b/q4/q4_3b/q4_3b.py
new file mode 100644
index 0000000..c98fee2
--- /dev/null
+++ b/q4/q4_3b/q4_3b.py
@@ -0,0 +1,13 @@
+import matplotlib.pyplot as plt
+import json
+movies= json.load(open('movies.json',encoding='utf-8'))
+rating=[]
+durations=[]
+for m in movies:
+    durations.append(m['duration'])
+plt.title("时长分布")        
+plt.xlabel("min")      
+plt.figure(figsize=(8,5))
+plt.hist(durations,bins=5,color='green')
+plt.savefig('q4_3b_hist.png',dpi=150)
+                    
\ No newline at end of file
diff --git a/q4/q4_3b/q4_3b_hist.png b/q4/q4_3b/q4_3b_hist.png
new file mode 100644
index 0000000..ac4c548
Binary files /dev/null and b/q4/q4_3b/q4_3b_hist.png differ