diff --git a/client/src/api/leave.ts b/client/src/api/leave.ts
index 5e5386aa..2c6db939 100644
--- a/client/src/api/leave.ts
+++ b/client/src/api/leave.ts
@@ -90,6 +90,7 @@ export type LeaveWorkingDaysPreview = {
   weekendDayCount: number;
   adjustedWorkdayCount: number;
   calendarApplied: boolean;
+  isNonWorkingRange: boolean;
 };
 
 export type LeaveListQuery = {
diff --git a/client/src/pages/LeaveRequestPage.tsx b/client/src/pages/LeaveRequestPage.tsx
index b1c2d127..e8dcfaac 100644
--- a/client/src/pages/LeaveRequestPage.tsx
+++ b/client/src/pages/LeaveRequestPage.tsx
@@ -303,6 +303,7 @@ export function LeaveRequestPage() {
 
   const effectiveRequestedDaysPreview =
     workingDaysPreviewQuery.data?.requestedDays ?? localRequestedDaysPreview;
+  const isNonWorkingPreview = Boolean(workingDaysPreviewQuery.data?.isNonWorkingRange);
 
   const balanceSummary = useMemo(() => {
     return (balancesQuery.data?.items ?? []).reduce(
@@ -784,7 +785,15 @@ export function LeaveRequestPage() {
               </p>
             ) : null}
 
-            {workingDaysPreviewQuery.data && workingDaysPreviewQuery.data.holidayDayCount > 0 ? (
+            {isNonWorkingPreview ? (
+              <p className="rounded-lg border border-zinc-200 bg-zinc-50 px-3 py-2 text-sm text-zinc-700">
+                所选日期范围均为非工作日，无需提交请假
+              </p>
+            ) : null}
+
+            {workingDaysPreviewQuery.data &&
+            !isNonWorkingPreview &&
+            workingDaysPreviewQuery.data.holidayDayCount > 0 ? (
               <p className="rounded-lg border border-sky-200 bg-sky-50 px-3 py-2 text-sm text-sky-700">
                 选择的日期范围内包含 {workingDaysPreviewQuery.data.holidayDayCount} 天法定假日，实际请假天数为{" "}
                 {workingDaysPreviewQuery.data.requestedDays} 天
@@ -893,7 +902,7 @@ export function LeaveRequestPage() {
                 ) : null}
                 <Button
                   type="button"
-                  disabled={isSavingForm}
+                  disabled={isSavingForm || isNonWorkingPreview}
                   onClick={() => {
                     if (editingLeaveRequest) {
                       updateMutation.mutate();
diff --git a/issues/2026-04-14_r62-preview-non-working-fix.csv b/issues/2026-04-14_r62-preview-non-working-fix.csv
new file mode 100644
index 00000000..f30c345c
--- /dev/null
+++ b/issues/2026-04-14_r62-preview-non-working-fix.csv
@@ -0,0 +1,7 @@
+ID,Title,Description,Acceptance,Test_Method,Tools,Dev_Status,Review1_Status,Regression_Status,Files,Dependencies,Notes
+"A1","R62 Fix 执行合同建档与范围冻结","创建并校验 R62 剩余边界修复执行合同 CSV，范围固定为：1) leave working-days 预览对全非工作日区间返回 0 天而非报错；2) 创建/编辑请假仍拒绝 0 天；3) 请假页显示“无需提交请假”且不再回退本地自然日；4) QA 收口。","issues/2026-04-14_r62-preview-non-working-fix.csv 列完整、Dependencies 为 JSON 数组字符串，修复范围仅覆盖全非工作日预览边界，不扩展到其他 leave/holiday 行为。","命令：python3 /home/shunli/.codex/skills/plan/scripts/validate_issues_csv.py issues/2026-04-14_r62-preview-non-working-fix.csv。检查：1) 对照 AGENTS.md 确认 12 列完整；2) A2-A6 依赖合理；3) Notes 写明无迁移、回滚方式。","manual","DONE","DONE","DONE","issues/2026-04-14_r62-preview-non-working-fix.csv","[]","回滚路径：删除本次 CSV 不影响业务。无 Prisma 迁移、无新依赖。"
+"A2","后端预览接口对全非工作日区间返回 0 天","调整 leave 工作日预览逻辑：`GET /api/leave-requests/working-days` 在区间全部落入 holiday/weekend 时返回 `200`，携带 `requestedDays=0`、分类计数和 `isNonWorkingRange=true`，不再抛 `non_working_range`。","1) 预览接口对全假期/全周末区间返回 200；2) 返回字段包含 `requestedDays,naturalRequestedDays,holidayDayCount,weekendDayCount,adjustedWorkdayCount,calendarApplied,isNonWorkingRange`；3) 非全非工作日场景保持原结果不变。","命令：export PATH=/home/shunli/.nvm/versions/node/v22.20.0/bin:$PATH && cd server && node --check src/services/leave.js && node --check src/routes/leave.js。业务：1) 预览 `2026-05-01~2026-05-05` 返回 0 天且 `holidayDayCount=5`；2) 预览 `2026-04-30~2026-05-05` 返回 1 天。","manual","DONE","DONE","DONE","server/src/services/leave.js|server/src/routes/leave.js|server/tests/unit/services/leave.test.js|server/tests/unit/routes/leave.working-days.test.js","[""A1""]","回滚路径：恢复 preview helper 对 `requestedUnits<=0` 直接抛错。"
+"A3","创建/编辑请假继续拒绝 0 天请假单","保持真实业务提交约束：创建/编辑请假单时，如果工作日计算结果为 0 天，仍返回 `VALID_001/non_working_range`，避免生成 0 天草稿或提交单。","1) 仅预览接口放宽为可返回 0 天；2) `POST /api/leave-requests` 与 `PATCH /api/leave-requests/:id` 对 0 天区间仍拒绝；3) 与 R62 其他节假日扣减口径一致。","命令：export PATH=/home/shunli/.nvm/versions/node/v22.20.0/bin:$PATH && cd server && node --check src/routes/leave.js && npm test -- tests/unit/routes/leave.working-days.test.js tests/unit/services/leave.test.js。业务：尝试提交全假期区间时，接口仍拒绝创建 0 天请假。","manual","DONE","DONE","DONE","server/src/routes/leave.js|server/tests/unit/routes/leave.working-days.test.js","[""A2""]","回滚路径：恢复创建/编辑共享旧逻辑。"
+"A4","前端请假页显示无需请假提示且不回退自然日","调整 LeaveRequestPage：当预览接口返回 `requestedDays=0` 且 `isNonWorkingRange=true` 时，页面展示“所选日期范围均为非工作日，无需提交请假”，本次预估显示 0，不再因为 query error 回退到本地自然日 5 天；创建/保存按钮保持不可提交。","1) `2026-05-01~2026-05-05` 页面显示 0 天与无需请假提示；2) 不再显示通用“工作日预览失败”提示；3) 非全非工作日场景仍可正常显示法定假日提示与预估天数。","命令：export PATH=/home/shunli/.nvm/versions/node/v22.20.0/bin:$PATH && cd client && npm run typecheck && npm run build。业务：1) 选全假期区间显示 0 天与无需请假提示；2) 选跨工作日+假期区间仍显示“包含 X 天法定假日”。","manual","DONE","DONE","DONE","client/src/api/leave.ts|client/src/pages/LeaveRequestPage.tsx","[""A2"",""A3""]","回滚路径：移除前端 `isNonWorkingRange` 分支，恢复原提示逻辑。"
+"A5","测试补齐全非工作日预览边界","补齐后端单测，覆盖全非工作日预览返回 0、跨假期区间返回有效工作日、创建/编辑仍拒绝 0 天区间。","1) leave service/route 单测覆盖全非工作日预览返回 0；2) 不影响现有跨假期扣减测试；3) 创建/编辑约束保持。","命令：export PATH=/home/shunli/.nvm/versions/node/v22.20.0/bin:$PATH && cd server && npm test -- tests/unit/services/leave.test.js tests/unit/routes/leave.working-days.test.js。业务：全假期区间预览返回 0，提交仍拒绝。","manual","DONE","DONE","DONE","server/tests/unit/services/leave.test.js|server/tests/unit/routes/leave.working-days.test.js","[""A2"",""A3""]","回滚路径：删除新增断言与测试数据。"
+"A6","QA、状态回填与提交收口","执行静态检查、单测、前端构建，回填 CSV 状态并提交。","受影响检查与测试通过；issues/2026-04-14_r62-preview-non-working-fix.csv 三列状态全部回填；提交信息引用本轮 Issue。","命令：python3 /home/shunli/.codex/skills/plan/scripts/validate_issues_csv.py issues/2026-04-14_r62-preview-non-working-fix.csv && export PATH=/home/shunli/.nvm/versions/node/v22.20.0/bin:$PATH && cd server && node --check src/services/leave.js && node --check src/routes/leave.js && npm test -- tests/unit/services/leave.test.js tests/unit/routes/leave.working-days.test.js && cd ../client && npm run typecheck && npm run build。业务：1) 全假期预览显示 0 天；2) 提交仍拒绝 0 天；3) 跨假期区间预估仍正确。","manual","DONE","DONE","DONE","issues/2026-04-14_r62-preview-non-working-fix.csv|server/src/services/leave.js|server/src/routes/leave.js|server/tests/unit/services/leave.test.js|server/tests/unit/routes/leave.working-days.test.js|client/src/api/leave.ts|client/src/pages/LeaveRequestPage.tsx","[""A5""]","回滚路径：若 post-check 失败，暂停提交并回退 R62 Fix 代码。commit message：R62 Fix A1-A6：请假预览全非工作日处理。"
diff --git a/server/src/routes/leave.js b/server/src/routes/leave.js
index f8f8e1fc..d248022a 100644
--- a/server/src/routes/leave.js
+++ b/server/src/routes/leave.js
@@ -233,10 +233,13 @@ function buildNaturalWorkingDaysPreview(body) {
     weekendDayCount: 0,
     adjustedWorkdayCount: 0,
     calendarApplied: false,
+    isNonWorkingRange: false,
   };
 }
 
-async function resolveWorkingDaysPreview(fastify, employee, body) {
+async function resolveWorkingDaysPreview(fastify, employee, body, options = {}) {
+  const allowNonWorkingRange = Boolean(options.allowNonWorkingRange);
+
   if (!employee?.legal_entity_id) {
     return buildNaturalWorkingDaysPreview(body);
   }
@@ -288,11 +291,14 @@ async function resolveWorkingDaysPreview(fastify, employee, body) {
     startSession: body.startSession,
     endSession: body.endSession,
     calendarDays: calendar.days,
+    allowNonWorkingRange,
   });
 }
 
 async function resolveRequestedDaysForCreate(fastify, employee, body) {
-  const preview = await resolveWorkingDaysPreview(fastify, employee, body);
+  const preview = await resolveWorkingDaysPreview(fastify, employee, body, {
+    allowNonWorkingRange: false,
+  });
   return preview.requestedDays;
 }
 
@@ -579,7 +585,9 @@ async function leaveRoutes(fastify) {
     },
     async (request, reply) => {
       const query = parseWorkingDaysPreviewQuery(request.query);
-      const preview = await resolveWorkingDaysPreview(fastify, request.employee, query);
+      const preview = await resolveWorkingDaysPreview(fastify, request.employee, query, {
+        allowNonWorkingRange: true,
+      });
 
       return sendData(reply, request, preview);
     },
diff --git a/server/src/services/leave.js b/server/src/services/leave.js
index 9ec0b719..7d077de7 100644
--- a/server/src/services/leave.js
+++ b/server/src/services/leave.js
@@ -140,6 +140,7 @@ function calculateRequestedDaysPreviewByWorkingCalendar({
   startSession,
   endSession,
   calendarDays = [],
+  allowNonWorkingRange = false,
 }) {
   const naturalRequestedDays = calculateRequestedDays({
     startDate,
@@ -184,7 +185,19 @@ function calculateRequestedDaysPreviewByWorkingCalendar({
   }
 
   if (requestedUnits <= 0) {
-    throw buildLeaveValidationError({ leave: "non_working_range" });
+    if (!allowNonWorkingRange) {
+      throw buildLeaveValidationError({ leave: "non_working_range" });
+    }
+
+    return {
+      requestedDays: 0,
+      naturalRequestedDays,
+      holidayDayCount: fromHalfDayUnits(holidayUnits),
+      weekendDayCount: fromHalfDayUnits(weekendUnits),
+      adjustedWorkdayCount: fromHalfDayUnits(adjustedWorkdayUnits),
+      calendarApplied: true,
+      isNonWorkingRange: true,
+    };
   }
 
   return {
@@ -194,6 +207,7 @@ function calculateRequestedDaysPreviewByWorkingCalendar({
     weekendDayCount: fromHalfDayUnits(weekendUnits),
     adjustedWorkdayCount: fromHalfDayUnits(adjustedWorkdayUnits),
     calendarApplied: true,
+    isNonWorkingRange: false,
   };
 }
 
diff --git a/server/tests/unit/routes/leave.working-days.test.js b/server/tests/unit/routes/leave.working-days.test.js
index b977890e..bb9fbb28 100644
--- a/server/tests/unit/routes/leave.working-days.test.js
+++ b/server/tests/unit/routes/leave.working-days.test.js
@@ -136,6 +136,7 @@ describe("leave working-days route", () => {
       weekendDayCount: 0,
       adjustedWorkdayCount: 1,
       calendarApplied: true,
+      isNonWorkingRange: false,
     });
 
     await app.close();
@@ -158,6 +159,44 @@ describe("leave working-days route", () => {
       weekendDayCount: 0,
       adjustedWorkdayCount: 0.5,
       calendarApplied: true,
+      isNonWorkingRange: false,
+    });
+
+    await app.close();
+  });
+
+  it("returns zero days instead of error for fully non-working preview ranges", async () => {
+    const { app } = await buildApp({
+      legalEntity: buildLegalEntity({
+        default_holiday_calendar: {
+          id: "calendar-1",
+          archived_at: null,
+          days: [
+            buildCalendarDay("2026-05-01", "holiday"),
+            buildCalendarDay("2026-05-02", "holiday"),
+            buildCalendarDay("2026-05-03", "holiday"),
+            buildCalendarDay("2026-05-04", "holiday"),
+            buildCalendarDay("2026-05-05", "holiday"),
+          ],
+        },
+      }),
+    });
+
+    const response = await app.inject({
+      method: "GET",
+      url: "/api/leave-requests/working-days?startDate=2026-05-01&endDate=2026-05-05&startSession=am&endSession=pm",
+      headers: { authorization: "Bearer test" },
+    });
+
+    expect(response.statusCode).toBe(200);
+    expect(response.json().data).toEqual({
+      requestedDays: 0,
+      naturalRequestedDays: 5,
+      holidayDayCount: 5,
+      weekendDayCount: 0,
+      adjustedWorkdayCount: 0,
+      calendarApplied: true,
+      isNonWorkingRange: true,
     });
 
     await app.close();
@@ -182,6 +221,7 @@ describe("leave working-days route", () => {
       weekendDayCount: 0,
       adjustedWorkdayCount: 0,
       calendarApplied: false,
+      isNonWorkingRange: false,
     });
     expect(featureFlagFindUnique).not.toHaveBeenCalled();
     expect(legalEntityFindUnique).not.toHaveBeenCalled();
diff --git a/server/tests/unit/services/leave.test.js b/server/tests/unit/services/leave.test.js
index e53aabaf..045f3fc2 100644
--- a/server/tests/unit/services/leave.test.js
+++ b/server/tests/unit/services/leave.test.js
@@ -121,6 +121,7 @@ describe("Leave Service", () => {
         weekendDayCount: 0,
         adjustedWorkdayCount: 1,
         calendarApplied: true,
+        isNonWorkingRange: false,
       });
     });
 
@@ -143,6 +144,34 @@ describe("Leave Service", () => {
         weekendDayCount: 0,
         adjustedWorkdayCount: 0.5,
         calendarApplied: true,
+        isNonWorkingRange: false,
+      });
+    });
+
+    it("returns zero-day preview for fully non-working ranges when explicitly allowed", () => {
+      expect(
+        calculateRequestedDaysPreviewByWorkingCalendar({
+          startDate: "2026-05-01",
+          endDate: "2026-05-05",
+          startSession: "am",
+          endSession: "pm",
+          allowNonWorkingRange: true,
+          calendarDays: [
+            { date: "2026-05-01", day_type: "holiday" },
+            { date: "2026-05-02", day_type: "holiday" },
+            { date: "2026-05-03", day_type: "holiday" },
+            { date: "2026-05-04", day_type: "holiday" },
+            { date: "2026-05-05", day_type: "holiday" },
+          ],
+        }),
+      ).toEqual({
+        requestedDays: 0,
+        naturalRequestedDays: 5,
+        holidayDayCount: 5,
+        weekendDayCount: 0,
+        adjustedWorkdayCount: 0,
+        calendarApplied: true,
+        isNonWorkingRange: true,
       });
     });
   });