diff --git a/图书管理系统.c b/图书管理系统.c
index 65fd211..46285b1 100644
--- a/图书管理系统.c
+++ b/图书管理系统.c
@@ -89,6 +89,56 @@ void ShowMainMenu()
 //C9
 
 //C10
+void returnBook(Reader* reader1, Book* book1)
+{
+    Reader* reader = reader1;
+    Book* book = book1;
+    printf("请输入读者的id:");
+    int id;
+    scanf("%d", &id);
+    getchar();
+    if (reader != NULL)
+    {
+        while (reader != NULL)
+        {
+            if (id == reader->iNum)
+            {
+                printf("请输入要还的书的编号:");
+                int id_book;
+                scanf("%d", &id_book);
+                getchar();
+                for (int i = 0; i < reader->iMax; i++)
+                {
+                    if (reader->aiBookId[i] == id_book)
+                    {
+                        reader->aiBookId[i] = 0;
+                        while (book)
+                        {
+                            if (id_book == book->iNum)
+                            {
+                                book->iAmount++;
+                                printf("还书成功!\n");
+                                printf("按任意键返回\n");
+                                getchar();
+                                return reader1;
+                            }
+                            book = book->next;
+                        }
+                    }
+                }
+                printf("没有找到该图书，检查图书的Id\n");
+                printf("按任意键返回\n");
+                getchar();
+                return reader1;
+            }
+            reader = reader->next;
+        }
+        printf("没有找到该读者，检查读者id是否输入有误\n");
+        printf("按任意键返回\n");
+        getchar();
+        return reader1;
+    }
+}
 
 //C11