diff --git a/frontend/src/layout/components/SemesterBar.vue b/frontend/src/layout/components/SemesterBar.vue
index 6c69a63a..5250397b 100644
--- a/frontend/src/layout/components/SemesterBar.vue
+++ b/frontend/src/layout/components/SemesterBar.vue
@@ -17,45 +17,19 @@
       <span class="week">{{ weekText }}</span>
     </div>
 
-    <span class="semester-bar__divider" />
-
-    <!-- 右：学期切换下拉框 -->
-    <div class="semester-bar__item semester-bar__switch">
-      <span class="label">切换学期</span>
-      <div class="semester-select-wrap">
-        <el-select
-          :value="activeSemester ? activeSemester.nd : ''"
-          placeholder="请选择学期"
-          size="small"
-          filterable
-          class="semester-select"
-          @change="handleSwitch"
-        >
-          <el-option
-            v-for="item in semesterList"
-            :key="item.nd"
-            :label="getSemesterName(item.nd)"
-            :value="item.nd"
-          />
-        </el-select>
-      </div>
     </div>
-  </div>
 </template>
 
 <script>
-import { listSemester, updateSemester } from '@/api/teachBusiness/semester'
+import { listSemester } from '@/api/teachBusiness/semester'
 
 export default {
   name: 'SemesterBar',
   data() {
     return {
-      // 学期列表（接口数据）
-      semesterList: [],
       // 当前选中的学期对象
       activeSemester: null,
-      today: new Date(),
-      loading: false
+      today: new Date()
     }
   },
   computed: {
@@ -84,19 +58,15 @@ export default {
     this.getSemesterList()
   },
   methods: {
-    /** 加载学期列表，默认选中当前学期（dqxq=true），无当前学期则选第一条 */
+    /** 加载当前学期（dqxq=true），无当前学期则取第一条 */
     getSemesterList() {
-      this.loading = true
       listSemester({ pageNum: 1, pageSize: 100 }).then(response => {
         const data = response.data || {}
         const list = data.records || []
-        this.semesterList = list
         const current = list.find(i => i.dqxq)
         this.activeSemester = current || (list[0] ? list[0] : null)
-        this.loading = false
       }).catch(() => {
-        this.semesterList = []
-        this.loading = false
+        this.activeSemester = null
       })
     },
     /** 格式化后端 LocalDateTime（2026-02-23T00:00:00 -> 2026-02-23） */
@@ -112,32 +82,6 @@ export default {
       const xq = s.slice(4)
       const map = { '01': '春季学期', '02': '夏季学期', '03': '秋季学期' }
       return xn + '年' + (map[xq] || '第' + xq + '学期')
-    },
-    /** 切换学期：将目标学期设为当前学期，原当前学期取消 */
-    handleSwitch(nd) {
-      const current = this.activeSemester
-      if (!nd || (current && nd === current.nd)) return
-      const target = this.semesterList.find(i => i.nd === nd)
-      if (!target) return
-      // 当前已是"当前学期"的其他记录（需取消）
-      const others = this.semesterList.filter(i => i.dqxq && i.nd !== nd)
-
-      updateSemester({ ...target, dqxq: true }).then(() => {
-        // 若存在原当前学期，一并取消
-        if (others.length) {
-          return Promise.all(others.map(o => updateSemester({ ...o, dqxq: false })))
-        }
-        return Promise.resolve()
-      }).then(() => {
-        this.activeSemester = target
-        this.$message.success(`已切换至：${this.getSemesterName(nd)}`)
-        // 重新拉取，同步最新 dqxq 状态
-        this.getSemesterList()
-        // 通知学期管理页面自动刷新
-        this.$root.$emit('semester-current-changed')
-      }).catch(() => {
-        this.$message.error('切换学期失败，请稍后重试')
-      })
     }
   }
 }
@@ -221,66 +165,5 @@ export default {
   &__divider {
     display: none;
   }
-
-  &__switch {
-    background: transparent;
-    border: none;
-    padding: 0;
-    border-radius: 0;
-    height: 36px;
-
-    /* 用一层定高 flex 容器包裹 select，彻底隔离其默认行高外溢 */
-    .semester-select-wrap {
-      display: flex;
-      align-items: center;
-      height: 36px;
-    }
-
-    .semester-select {
-      width: 200px;
-    }
-
-    /* 关闭 select/input 外层默认行高，交给 flex 居中 */
-    ::v-deep .el-select,
-    ::v-deep .el-input {
-      height: 36px;
-      line-height: normal;
-    }
-
-  }
-}
-</style>
-
-<style lang="scss">
-/* 顶部学期选择器使用导航栏色系，避免被全局白色表单控件样式覆盖。 */
-#app .semester-bar__switch .semester-select {
-  .el-input__inner {
-    height: 36px;
-    padding: 0 34px 0 13px;
-    border: 1px solid rgba(255, 255, 255, 0.22);
-    border-radius: 7px;
-    color: #ffffff;
-    background: rgba(255, 255, 255, 0.10);
-    box-shadow: none;
-
-    &::placeholder {
-      color: rgba(255, 255, 255, 0.68);
-    }
-
-    &:hover {
-      border-color: rgba(255, 255, 255, 0.38);
-      background: rgba(255, 255, 255, 0.14);
-    }
-
-    &:focus {
-      border-color: rgba(255, 255, 255, 0.55);
-      background: rgba(255, 255, 255, 0.14);
-      box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.08);
-    }
-  }
-
-  .el-input__icon {
-    color: rgba(255, 255, 255, 0.82);
-  }
 }
 </style>
diff --git a/frontend/src/views/teachBusiness/semester/index.vue b/frontend/src/views/teachBusiness/semester/index.vue
index c627ef00..ab9a82da 100644
--- a/frontend/src/views/teachBusiness/semester/index.vue
+++ b/frontend/src/views/teachBusiness/semester/index.vue
@@ -265,7 +265,14 @@ export default {
   },
   watch: {
     'form.kxrq': 'calculateWeeks',
-    'form.jsrq': 'calculateWeeks'
+    'form.jsrq': 'calculateWeeks',
+    // 新增时选择学期类型后，自动带出开学/结束日期
+    'form.xq'(val) {
+      if (this.isAdd) this.autoFillDatesForXq()
+    },
+    'form.xn'(val) {
+      if (this.isAdd) this.autoFillDatesForXq()
+    }
   },
   methods: {
     /** 顶栏切换当前学期后自动刷新 */
@@ -286,6 +293,23 @@ export default {
       if (xn === undefined || xn === null || xn === '' || !xq) return ''
       return String(xn) + String(xq)
     },
+    /** 根据学年+学期类型自动带出开学/结束日期（春季01:2-5月，夏季02:6-8月，秋季03:9-12月） */
+    autoFillDatesForXq() {
+      const xn = this.form.xn
+      const xq = this.form.xq
+      if (xn === undefined || xn === null || xn === '') return
+      const year = Number(xn)
+      const pad = m => `${year}-${String(m).padStart(2, '0')}`
+      const rules = {
+        '01': { start: pad(2) + '-01', end: pad(5) + '-31' },
+        '02': { start: pad(6) + '-01', end: pad(8) + '-31' },
+        '03': { start: pad(9) + '-01', end: pad(12) + '-31' }
+      }
+      const rule = rules[xq]
+      if (!rule) return
+      this.form.kxrq = rule.start
+      this.form.jsrq = rule.end
+    },
     /** 学期代号 -> 学期名称（如 202601 -> 2026年春季学期） */
     getSemesterName(nd) {
       if (!nd) return ''