diff --git a/src/api/module/notice.ts b/src/api/module/notice.ts
index 0874f5a..bf63268 100644
--- a/src/api/module/notice.ts
+++ b/src/api/module/notice.ts
@@ -123,6 +123,10 @@ class NoticeApi {
     flowTrace(serid: number) {
         return get<FlowTraceVo>(`${NOTICE}/flow/Trace`, { serid });
     }
+    /** 撤回审核（2026-09-17：后端经 SDK 托管件中转，仅创建人本人+审批中；替代原先前端直调 flow-center） */
+    flowWithdraw(serid: number) {
+        return postForm<void>(`${NOTICE}/flow/Withdraw`, { serid });
+    }
     /** 应用级流程绑定（应用设置 > 流程绑定；发通知页据此判断「提交审核」还是「发送」） */
     getFlowBinding() {
         return get<FlowBindingVo>(`${NOTICE}/flow/Binding`);
diff --git a/src/types/notice.ts b/src/types/notice.ts
index 4b48f40..fa3fc77 100644
--- a/src/types/notice.ts
+++ b/src/types/notice.ts
@@ -118,6 +118,23 @@ export interface FlowTraceVo {
     finishTime?: string | null;
     /** 办理轨迹（traceJson 解析后的数组） */
     trace?: any[] | null;
+    /** 结构化步骤（2026-09-17 接入：steps[0] 固定"发起申请"，同节点多任务每人一行） */
+    steps?: FlowProgressStepVo[] | null;
+}
+
+/** 流程步骤（SDK FlowProgressStep 同构：后端 /flow/Trace 的 steps 元素） */
+export interface FlowProgressStepVo {
+    nodeId: string;
+    nodeName: string | null;
+    label: string | null;
+    active: boolean;
+    assignees?: {
+        userName?: string | null;
+        status?: number | null;
+        statusLabel?: string | null;
+        opinion?: string | null;
+        handleTime?: string | null;
+    }[] | null;
 }
 
 // ============================ 通知详情 ============================
diff --git a/src/views/notice/NoticeDetails.vue b/src/views/notice/NoticeDetails.vue
index 8098739..f6e34eb 100644
--- a/src/views/notice/NoticeDetails.vue
+++ b/src/views/notice/NoticeDetails.vue
@@ -36,35 +36,59 @@ async function loadTrace() {
     }
 }
 
-/** 撤回/催办直调 flow-center 用户面（同主域 CAS 免二次登录；本地 dev 走 flowHost CORS） */
+/**
+ * 撤回：走本应用后端（2026-09-17 接入：后端经 SDK 托管件中转并复核创建人，
+ * 不再前端直调 flow-center——跨应用 CAS 票据 + CORS 双重外溢且"谁能撤"落在前端）。
+ * 催办：仍是"人"的动作，走 flow-center 用户面（同主域 CAS 免二次登录）。
+ */
 async function flowAction(action: "withdraw" | "urge") {
     const instanceId = detail.value?.flowInstanceId;
-    if (!instanceId || !config.flowHost) return;
+    if (!instanceId) return;
     flowActing.value = true;
     try {
-        const resp = await fetch(`${config.flowHost}/api/flow/instance/${instanceId}/${action}`, {
-            method: "POST",
-            credentials: "include",
-        });
-        const res = await resp.json().catch(() => null);
-        if (resp.ok && res && res.code === 0) {
-            Message.success(action === "withdraw" ? "已撤回审核，可编辑后重新提交" : "已发送催办提醒");
-            load(); // 撤回后状态刷新
-            loadTrace();
+        if (action === "withdraw") {
+            await noticeApi.flowWithdraw(serid.value).send();
+            Message.success("已撤回审核，可编辑后重新提交");
+            await load();
+            await loadTrace();
         } else {
-            Message.error(res?.msg || (action === "withdraw" ? "撤回失败（已有人办理时不可撤回）" : "催办失败"));
+            if (!config.flowHost) return;
+            const resp = await fetch(`${config.flowHost}/api/flow/instance/${instanceId}/urge`, {
+                method: "POST",
+                credentials: "include",
+            });
+            const res = await resp.json().catch(() => null);
+            if (resp.ok && res && res.code === 0) {
+                Message.success("已发送催办提醒");
+            } else {
+                Message.error(res?.msg || "催办失败");
+            }
         }
     } catch (e: any) {
-        Message.error("流程中心不可达：" + (e.message || e));
+        Message.error(
+            action === "withdraw"
+                ? "撤回失败（已有人办理时不可撤回）：" + (e?.msg || e?.message || e)
+                : "流程中心不可达：" + (e?.message || e),
+        );
     } finally {
         flowActing.value = false;
     }
 }
 
-/** 查看流程图：flow-center 示意图深链（绑流程时；Notice 指定到人场景用人员视图） */
+/* 流程图弹窗（2026-09-17：后端同源出图 /flow/Diagram，img 免 token 免跨域，不再深链 flow-center） */
+const diagramVisible = ref(false);
 function openFlowDiagram() {
-    if (!detail.value?.flowGuid || !config.flowHost) return;
-    window.open(`${config.flowHost}/#/diagram?flowGuid=${detail.value.flowGuid}&mode=user`, "_blank");
+    if (!detail.value?.flowGuid || !detail.value?.flowInstanceId) return;
+    diagramVisible.value = true;
+}
+const diagramSrc = computed(() =>
+    diagramVisible.value && detail.value?.flowInstanceId
+        ? `${config.serviceHost}/api/notice/flow/Diagram?serid=${serid.value}`
+        : "",
+);
+function onDiagramError() {
+    diagramVisible.value = false;
+    Message.error("流程图加载失败（可能已过期，请刷新页面重试）");
 }
 const readGroups = ref<ReadGroup[]>([]);
 const showRead = ref(false);
@@ -264,8 +288,26 @@ function openPreview(item: { name?: string; filename?: string; fileid?: number;
                 办理意见：{{ flowTrace.flowResult.opinion }}
                 <template v-if="flowTrace.flowResult.rejectNode">（{{ flowTrace.flowResult.rejectNode }}）</template>
             </div>
-            <!-- 节点时间线（traceJson 解析） -->
-            <div v-if="flowTrace.trace && flowTrace.trace.length" class="flow-timeline">
+            <!-- 结构化步骤时间线（2026-09-17 接入 SDK progress；steps[0] 固定"发起申请"，同节点多任务每人一行） -->
+            <div v-if="flowTrace.steps && flowTrace.steps.length" class="flow-timeline">
+                <div
+                    v-for="(s, i) in flowTrace.steps"
+                    :key="'fs' + i"
+                    class="flow-step"
+                    :class="{ 'flow-step-active': s.active }"
+                >
+                    <span class="flow-step-node">{{ s.label || s.nodeName || `节点${i + 1}` }}</span>
+                    <template v-if="s.assignees && s.assignees.length">
+                        <span v-for="(a, j) in s.assignees" :key="j" class="flow-step-user">
+                            {{ a.userName || "" }}
+                            <em v-if="a.statusLabel" class="flow-step-status">{{ a.statusLabel }}</em>
+                            <em v-if="a.opinion" class="flow-step-op">（{{ a.opinion }}）</em>
+                        </span>
+                    </template>
+                </div>
+            </div>
+            <!-- 节点时间线（traceJson 解析，steps 不可用时的兜底） -->
+            <div v-else-if="flowTrace.trace && flowTrace.trace.length" class="flow-timeline">
                 <div v-for="(t, i) in flowTrace.trace" :key="i" class="flow-step">
                     <span class="flow-step-node">{{ t.nodeName || t.node || t.taskName || `节点${i + 1}` }}</span>
                     <span class="flow-step-user">{{ t.userName || t.assigneeName || t.handlerName || "" }}</span>
@@ -275,6 +317,13 @@ function openPreview(item: { name?: string; filename?: string; fileid?: number;
             </div>
         </div>
 
+        <!-- 流程图弹窗（后端同源出图，免 token 免跨域） -->
+        <Modal v-model="diagramVisible" title="流程示意图" :width="860" footer-hide>
+            <div class="diagram-wrap">
+                <img v-if="diagramSrc" :src="diagramSrc" alt="流程示意图" @error="onDiagramError" />
+            </div>
+        </Modal>
+
         <div v-if="viewType !== 0" class="meta">
             <span>发文单位：{{ detail.DeptName || "—" }}</span>
             <span>发布人：{{ detail.TeaName || "—" }}</span>
@@ -410,6 +459,25 @@ function openPreview(item: { name?: string; filename?: string; fileid?: number;
 .flow-step-op {
     color: #ed4014;
 }
+.flow-step-active .flow-step-node {
+    color: #2d8cf0;
+    font-weight: 600;
+}
+.flow-step-status {
+    font-style: normal;
+    color: #808695;
+    margin-left: 4px;
+}
+.flow-step .flow-step-op {
+    font-style: normal;
+}
+.diagram-wrap {
+    text-align: center;
+    min-height: 200px;
+}
+.diagram-wrap img {
+    max-width: 100%;
+}
 .meta {
     display: flex;
     flex-wrap: wrap;