diff --git a/static/src/stores/resource.ts b/static/src/stores/resource.ts
index d015976..94d3786 100644
--- a/static/src/stores/resource.ts
+++ b/static/src/stores/resource.ts
@@ -52,6 +52,9 @@ const buildDefaultQuota = (): UsageQuota => ({
   role: 'user'
 });
 
+const PROJECT_STORAGE_POLL_INTERVAL_MS = 60_000;
+const PROJECT_STORAGE_POLL_INTERVAL_MAX_MS = 300_000;
+
 export const useResourceStore = defineStore('resource', {
   state: () => ({
     tokenPanelCollapsed: true,
@@ -75,6 +78,9 @@ export const useResourceStore = defineStore('resource', {
     lastContainerSample: null as ContainerSample | null,
     containerStatsTimer: null as ReturnType<typeof setInterval> | null,
     projectStorageTimer: null as ReturnType<typeof setInterval> | null,
+    projectStorageInFlight: false,
+    projectStorageFailCount: 0,
+    projectStorageIntervalMs: PROJECT_STORAGE_POLL_INTERVAL_MS,
     usageQuota: buildDefaultQuota(),
     usageQuotaTimer: null as ReturnType<typeof setInterval> | null
   }),
@@ -225,6 +231,10 @@ export const useResourceStore = defineStore('resource', {
       }
     },
     async pollProjectStorage() {
+      if (this.projectStorageInFlight) {
+        return;
+      }
+      this.projectStorageInFlight = true;
       try {
         const resp = await fetch('/api/project-storage');
         if (!resp.ok) {
@@ -236,9 +246,26 @@ export const useResourceStore = defineStore('resource', {
           this.projectStorage.limit_bytes = data.data.limit_bytes ?? null;
           this.projectStorage.limit_label = data.data.limit_label || '';
           this.projectStorage.usage_percent = data.data.usage_percent ?? null;
+          this.projectStorageFailCount = 0;
+          if (this.projectStorageIntervalMs > PROJECT_STORAGE_POLL_INTERVAL_MS) {
+            this._restartProjectStorageTimer(PROJECT_STORAGE_POLL_INTERVAL_MS);
+          }
         }
       } catch (err) {
+        this.projectStorageFailCount += 1;
         console.warn('获取存储信息失败:', err);
+        if (this.projectStorageFailCount >= 3) {
+          const slower = Math.min(
+            this.projectStorageIntervalMs * 2,
+            PROJECT_STORAGE_POLL_INTERVAL_MAX_MS
+          );
+          if (slower !== this.projectStorageIntervalMs) {
+            console.warn(`连续获取失败，存储轮询间隔调整为 ${Math.round(slower / 1000)} 秒`);
+            this._restartProjectStorageTimer(slower);
+          }
+        }
+      } finally {
+        this.projectStorageInFlight = false;
       }
     },
     startProjectStoragePolling() {
@@ -248,13 +275,25 @@ export const useResourceStore = defineStore('resource', {
       this.pollProjectStorage();
       this.projectStorageTimer = setInterval(() => {
         this.pollProjectStorage();
-      }, 5000);
+      }, this.projectStorageIntervalMs);
     },
     stopProjectStoragePolling() {
       if (this.projectStorageTimer) {
         clearInterval(this.projectStorageTimer);
         this.projectStorageTimer = null;
       }
+      this.projectStorageInFlight = false;
+      this.projectStorageFailCount = 0;
+      this.projectStorageIntervalMs = PROJECT_STORAGE_POLL_INTERVAL_MS;
+    },
+    _restartProjectStorageTimer(intervalMs: number) {
+      if (this.projectStorageTimer) {
+        clearInterval(this.projectStorageTimer);
+      }
+      this.projectStorageIntervalMs = Math.max(intervalMs, 10_000);
+      this.projectStorageTimer = setInterval(() => {
+        this.pollProjectStorage();
+      }, this.projectStorageIntervalMs);
     },
     normalizeUsageQuota(raw: any) {
       const base = buildDefaultQuota();
diff --git a/web_server.py b/web_server.py
index eed9756..c0f5ff6 100644
--- a/web_server.py
+++ b/web_server.py
@@ -172,6 +172,8 @@ CSRF_EXEMPT_PATHS = {"/api/csrf-token"}
 FAILED_LOGIN_LIMIT = 5
 FAILED_LOGIN_LOCK_SECONDS = 300
 SOCKET_TOKEN_TTL_SECONDS = 45
+PROJECT_STORAGE_CACHE: Dict[str, Dict[str, Any]] = {}
+PROJECT_STORAGE_CACHE_TTL_SECONDS = float(os.environ.get("PROJECT_STORAGE_CACHE_TTL", "30"))
 
 
 def sanitize_filename_preserve_unicode(filename: str) -> str:
@@ -1147,6 +1149,10 @@ def get_container_status_api(terminal: WebTerminal, workspace: UserWorkspace, us
 @with_terminal
 def get_project_storage(terminal: WebTerminal, workspace: UserWorkspace, username: str):
     """获取项目目录占用情况，供前端轮询。"""
+    now = time.time()
+    cache_entry = PROJECT_STORAGE_CACHE.get(username)
+    if cache_entry and (now - cache_entry.get("ts", 0)) < PROJECT_STORAGE_CACHE_TTL_SECONDS:
+        return jsonify({"success": True, "data": cache_entry["data"]})
     try:
         file_manager = getattr(terminal, 'file_manager', None)
         if not file_manager:
@@ -1160,8 +1166,12 @@ def get_project_storage(terminal: WebTerminal, workspace: UserWorkspace, usernam
             "limit_label": f"{PROJECT_MAX_STORAGE_MB}MB" if PROJECT_MAX_STORAGE_MB else "未限制",
             "usage_percent": usage_percent
         }
+        PROJECT_STORAGE_CACHE[username] = {"ts": now, "data": data}
         return jsonify({"success": True, "data": data})
     except Exception as exc:
+        stale = PROJECT_STORAGE_CACHE.get(username)
+        if stale:
+            return jsonify({"success": True, "data": stale.get("data"), "stale": True}), 200
         return jsonify({"success": False, "error": str(exc)}), 500