diff --git a/bootstrap.php b/bootstrap.php
index e7b9db5..1982e9c 100644
--- a/bootstrap.php
+++ b/bootstrap.php
@@ -36,6 +36,30 @@ if ($missing !== []) {
 date_default_timezone_set('Asia/Shanghai');
 mb_internal_encoding('UTF-8');
 
+// ---------------- 内存上限（数据接口可能处理大量答卷）----------------
+// 拉取卷王全量答卷做 json_decode 时极易触顶 128M；在未被禁用 / 未被 php_admin_value 硬锁的前提下
+// 临时放宽到 512M。若主机用 php_admin_value 锁定了 memory_limit，下面的 ini_set 会静默失效，
+// 需要改主机 php.ini（或 fpm 池配置）才能生效。
+(function (): void {
+    $cur = (string) ini_get('memory_limit');
+    if ($cur === '' || $cur === '-1') {
+        return; // 未设置 / 已无限制，无需处理
+    }
+    $curBytes = (int) $cur;
+    $unit = strtoupper(substr($cur, -1));
+    if ($unit === 'G') {
+        $curBytes *= 1024 * 1024 * 1024;
+    } elseif ($unit === 'M') {
+        $curBytes *= 1024 * 1024;
+    } elseif ($unit === 'K') {
+        $curBytes *= 1024;
+    }
+    $want = 512 * 1024 * 1024;
+    if ($curBytes > 0 && $curBytes < $want) {
+        @ini_set('memory_limit', '512M');
+    }
+})();
+
 // ---------------- 会话 ----------------
 function ny_session_start(): void
 {
diff --git a/lib/SurveyKingClient.php b/lib/SurveyKingClient.php
index feed323..e96fb13 100644
--- a/lib/SurveyKingClient.php
+++ b/lib/SurveyKingClient.php
@@ -187,7 +187,10 @@ class SurveyKingClient
             $msg  = (string)($decoded['msg'] ?? $decoded['message'] ?? '');
         }
 
-        return ['status' => $status, 'headers' => $h, 'data' => $data, 'raw' => $rawBody, 'code' => $code, 'msg' => $msg];
+        // 仅保留前若干字符用于错误诊断；完整正文不再随返回值常驻内存，
+        // 避免大答卷响应在 json_decode 之外再额外占用一倍内存。
+        $rawDiag = mb_strcut($rawBody, 0, 2000);
+        return ['status' => $status, 'headers' => $h, 'data' => $data, 'raw' => $rawDiag, 'code' => $code, 'msg' => $msg];
     }
 
     /**
@@ -448,7 +451,7 @@ class SurveyKingClient
     /** 问卷 / 考试列表 */
     public function listProjects(): array
     {
-        $size = max(20, (int)($this->cfg['page_size'] ?? 200));
+        $size = min(200, max(20, (int)($this->cfg['page_size'] ?? 100)));
         $all  = [];
         for ($page = 1; $page <= 50; $page++) {
             $r = $this->request('/project/list', ['current' => $page, 'pageSize' => $size]);
@@ -483,7 +486,9 @@ class SurveyKingClient
     /** 答卷列表（自动翻页取全量） */
     public function listAnswers(string $projectId): array
     {
-        $size = max(20, (int)($this->cfg['page_size'] ?? 200));
+        // 单页上限夹在 20~200：无论配置 page_size 多大，单次 json_decode 的体量都被限制住，
+        // 避免一份超大响应直接撑爆 128M。100 页 × 200 = 最多 2 万份，足以覆盖学校级考试。
+        $size = min(200, max(20, (int)($this->cfg['page_size'] ?? 100)));
         $all  = [];
         for ($page = 1; $page <= 100; $page++) {
             $r = $this->request('/answer/list', [
@@ -502,10 +507,14 @@ class SurveyKingClient
                 }
             }
             $total = is_array($data) ? (int)($data['total'] ?? 0) : 0;
+            // 及时释放本页引用，降低峰值内存占用
+            $r = null;
+            $data = null;
+            $list = null;
             if ($total > 0 && count($all) >= $total) {
                 break;
             }
-            if (count($list) < $size) {
+            if (count($all) < $size) {
                 break;
             }
         }