diff --git a/src/pages/overall/overall-course/assignment-entry/assignment-entry.vue b/src/pages/overall/overall-course/assignment-entry/assignment-entry.vue
index 4ef6666..15d50c9 100644
--- a/src/pages/overall/overall-course/assignment-entry/assignment-entry.vue
+++ b/src/pages/overall/overall-course/assignment-entry/assignment-entry.vue
@@ -20,7 +20,7 @@
                 <span class="score entry-box">{{assignment.score}}</span>
                 <span class="max entry-box">{{assignment.scoreMax}}</span>
                 <el-button class="mark-as-read" size="mini" type="text"
-                           icon="el-icon-close" @click="markAsRead">
+                           icon="el-icon-close" @click="markAsRead" v-if="unread">
                 </el-button>
             </el-col>
         </el-row>