diff --git a/src/api/jingdong.ts b/src/api/jingdong.ts
index f71b440..09a2f7a 100644
--- a/src/api/jingdong.ts
+++ b/src/api/jingdong.ts
@@ -712,7 +712,14 @@ export const getUploadUrl = async (input: {
   )
 
   // 注意：若 Content-Type 不是 application/json，axios 会把 body 留成 string
-  const ticket = parseUploadUrlResult(response?.data)
+  const body = coerceResponseBody(response?.data)
+  const code = Number(body.code)
+  // 业务失败（如会话不存在）需抛出原文，避免被吞成「缺少 upload_id」
+  if (Number.isFinite(code) && code !== 1000 && code !== 0) {
+    throw new Error(textOf(body.message || body.msg) || '签发上传地址失败')
+  }
+
+  const ticket = parseUploadUrlResult(body)
 
   if (!ticket.upload_id) {
     throw new Error('签发上传地址失败：缺少 upload_id')
diff --git a/src/config/jingdong.ts b/src/config/jingdong.ts
index 6c6cc96..afaaac3 100644
--- a/src/config/jingdong.ts
+++ b/src/config/jingdong.ts
@@ -64,6 +64,8 @@ export const jingdongConfig = {
     needProductTitle: (label: string) => `请填写${label}后再发送`,
     uploadingTip: '正在上传照片，请稍候…',
     inspectingTip: '正在识别照片，请稍候…',
+    sessionLoadingTip: '页面加载中，请稍候再上传…',
+    sessionMissing: '会话未就绪，请稍候再试或刷新页面',
     /** 仅提示，不拦截发送 */
     subjectMismatchTip: '上传图片的主体数量与下单主体数量不一致，生图时候会按下单的主体数量自动调整主体',
     subjectMismatchToast: (got: string, need: string) =>
diff --git a/src/utils/jingdong-error.ts b/src/utils/jingdong-error.ts
index 0dcc83c..b56d377 100644
--- a/src/utils/jingdong-error.ts
+++ b/src/utils/jingdong-error.ts
@@ -32,6 +32,7 @@ const KNOWN: Record<string, string> = {
   效果图加载失败: '效果图加载失败，请重试',
   '效果图加载失败，请重试': '效果图加载失败，请重试',
   'product_id不在Agent开放分类': '当前产品暂不支持在线生图，请联系客服',
+  会话不存在: jingdongConfig.messages.sessionMissing,
 }
 
 /** 生图 / 编辑：内容策略单独翻译；Processing/ApiError 走场景兜底文案 */
diff --git a/src/views/jingdong/index.vue b/src/views/jingdong/index.vue
index 2ba5dfb..a8cd0a4 100644
--- a/src/views/jingdong/index.vue
+++ b/src/views/jingdong/index.vue
@@ -205,6 +205,10 @@ const remainCount = ref(0)
 /** 打底时已统计到的成功次数；新增成功 = 当前成功数 - baselineUsed */
 const remainBaselineUsed = ref(0)
 const sessionId = ref('')
+/** orders/stat 的 session_id 已通过 session/detail 确认可用 */
+const sessionReady = ref(false)
+/** 会话初始化结束但仍未就绪（需刷新） */
+const sessionBootFailed = ref(false)
 const subjectName = ref('')
 /** stat 返回的主体文案（订单约定主体，标签始终展示此值） */
 const subjectNameFromStat = ref('')
@@ -368,6 +372,11 @@ const canSend = computed(() => {
 
 const composerStatusTip = computed(() => {
   if (isBusy.value) return config.messages.generatingTip
+  if (!sessionReady.value) {
+    return sessionBootFailed.value
+      ? config.messages.sessionMissing
+      : config.messages.sessionLoadingTip
+  }
   if (uploading.value) return config.messages.uploadingTip
   if (inspecting.value) return config.messages.inspectingTip
   if (remainCount.value <= 0) return config.messages.noRemain
@@ -445,11 +454,26 @@ function scrollToBottom() {
   })
 }
 
+function isSessionMissingError(error: unknown) {
+  const msg =
+    error instanceof Error
+      ? String(error.message || '')
+      : typeof error === 'string'
+        ? error
+        : String((error as any)?.message || (error as any)?.msg || '')
+  return /会话不存在|session\s*(not\s*found|missing|invalid|expired)/i.test(msg)
+}
+
 function triggerUpload() {
   if (isBusy.value) {
     showToast(config.messages.generatingTip)
     return
   }
+  if (!sessionReady.value) {
+    showToast(config.messages.sessionLoadingTip)
+    void fetchOrderStat()
+    return
+  }
   if (isEditing.value) {
     showToast('编辑效果图时请直接描述想调整的内容')
     return
@@ -509,20 +533,40 @@ async function startPendingUploadAndClassify(file: File) {
   photoInspect.value = null
   subjectMatched.value = true
 
-  const sid = String(sessionId.value || '').trim()
-  if (!sid) {
-    showToast(friendlyError('缺少会话信息，请刷新后重试', 'common'))
+  let sid = String(sessionId.value || '').trim()
+  if (!sid || !sessionReady.value) {
+    await fetchOrderStat()
+    if (serial !== uploadSerial) return
+    sid = String(sessionId.value || '').trim()
+  }
+  if (!sid || !sessionReady.value) {
+    showToast(config.messages.sessionMissing)
     return
   }
 
   uploading.value = true
   inspecting.value = false
   try {
+    const runPrepare = () =>
+      jingdongApi.prepareUpload(file, {
+        session_id: sid,
+        purpose: 'origin',
+      })
+
     // 仅签发 url 并 PUT，不 confirm
-    const prepared = await jingdongApi.prepareUpload(file, {
-      session_id: sid,
-      purpose: 'origin',
-    })
+    let prepared
+    try {
+      prepared = await runPrepare()
+    } catch (error) {
+      // 偶发「会话不存在」：重拉会话后自动再试一次
+      if (!isSessionMissingError(error)) throw error
+      sessionReady.value = false
+      await fetchOrderStat()
+      if (serial !== uploadSerial) return
+      sid = String(sessionId.value || '').trim()
+      if (!sid || !sessionReady.value) throw error
+      prepared = await runPrepare()
+    }
     if (serial !== uploadSerial) return
     pendingUploadId.value = prepared.uploadId
     lastUploadId.value = prepared.uploadId
@@ -530,7 +574,9 @@ async function startPendingUploadAndClassify(file: File) {
     if (serial !== uploadSerial) return
     pendingUploadId.value = ''
     showToast({
-      message: friendlyError(error, 'upload'),
+      message: isSessionMissingError(error)
+        ? config.messages.sessionMissing
+        : friendlyError(error, 'upload'),
       duration: 2800,
     })
     return
@@ -1012,12 +1058,13 @@ function applySessionHistory(detail: ReturnType<typeof jingdongApi.parseSessionD
   scrollToBottom()
 }
 
-function fetchSessionDetail(sid: string) {
+/** 拉取 session/detail；成功返回 true（用于确认会话已在 JD 侧可用） */
+function fetchSessionDetail(sid: string): Promise<boolean> {
   const id = String(sid || '').trim()
   if (!id) {
     sessionDetail.value = null
     seedRemainFromApi(orderStat.value?.remain_count)
-    return Promise.resolve()
+    return Promise.resolve(false)
   }
   return jingdongApi
     .getSessionDetail({ session_id: id })
@@ -1030,17 +1077,31 @@ function fetchSessionDetail(sid: string) {
       }
       sessionDetail.value = parsed
       applySessionHistory(parsed)
+      return true
     })
     .catch(() => {
       sessionDetail.value = null
       seedRemainFromApi(orderStat.value?.remain_count)
+      return false
     })
 }
 
+/** detail 偶发未就绪时短退避重试，避免过早放开上传 */
+async function waitForSessionDetail(sid: string, attempts = 3): Promise<boolean> {
+  for (let i = 0; i < attempts; i += 1) {
+    const ok = await fetchSessionDetail(sid)
+    if (ok) return true
+    if (i < attempts - 1) await sleep(350 * (i + 1))
+  }
+  return false
+}
+
 function fetchOrderStat() {
+  sessionReady.value = false
+  sessionBootFailed.value = false
   return badgeApi
     .getOrderStat({})
-    .then((res: any) => {
+    .then(async (res: any) => {
       // interceptor 已解包 data：remain_count / subject_name / type_name / session_id / prod_id ...
       orderStat.value = res || {}
       subjectNameFromStat.value = String(res?.subject_name || '').trim()
@@ -1048,13 +1109,22 @@ function fetchOrderStat() {
       styleName.value = String(res?.style_name || '').trim()
       // 产品名称展示取 cate_name
       typeName.value = String(res?.cate_name || '').trim()
-      sessionId.value = String(res?.session_id || '').trim()
+      const sid = String(res?.session_id || '').trim()
+      sessionId.value = sid
       subjectMatched.value = true
       // 先记下接口值；等会话历史回来后再按已生成次数扣除
       const apiRemain = Number(res?.remain_count)
       remainCount.value = Number.isFinite(apiRemain) ? Math.max(0, apiRemain) : 0
       remainBaselineUsed.value = 0
-      return fetchSessionDetail(sessionId.value)
+      if (!sid) {
+        sessionReady.value = false
+        sessionBootFailed.value = true
+        return false
+      }
+      const ok = await waitForSessionDetail(sid)
+      sessionReady.value = ok
+      sessionBootFailed.value = !ok
+      return ok
     })
     .catch(() => {
       orderStat.value = null
@@ -1065,7 +1135,10 @@ function fetchOrderStat() {
       typeName.value = ''
       sessionId.value = ''
       sessionDetail.value = null
+      sessionReady.value = false
+      sessionBootFailed.value = true
       subjectMatched.value = true
+      return false
     })
 }