diff --git a/src/functions/course_add.ts b/src/functions/course_add.ts
index 4f302cc..397008d 100644
--- a/src/functions/course_add.ts
+++ b/src/functions/course_add.ts
@@ -140,14 +140,24 @@ function searchAdd(course_list: Course[]) {
 export function push_to_table(mode: Number, item: any) {
   if (mode == 1) {
     console.log(item);
-    if (
-      item.className == "" ||
-      item.classRoom == "" ||
-      item.weekDay == "星期" ||
-      item.start == "始堂" ||
-      item.end == "終堂"
-    ) {
-      alert("錯誤");
+    if (item.className === undefined) {
+      alert("請輸入課程名稱");
+      return false;
+    }
+    else if (item.classRoom === undefined) {
+      alert("請輸入教室");
+      return false;
+    }
+    else if (item.weekDay == "星期") {
+      alert("請選擇星期");
+      return false;
+    }
+    else if (item.start == "始堂") {
+      alert("請選擇開始時間");
+      return false;
+    }
+    else if (item.end == "終堂") {
+      alert("請選擇結束時間");
       return false;
     }
     let check = courseAdd(