diff --git a/src/ApolloClient.php b/src/ApolloClient.php
index d78b6c0..cb5f5df 100644
--- a/src/ApolloClient.php
+++ b/src/ApolloClient.php
@@ -134,11 +134,13 @@ public function pullConfigBatch(array $namespaceNames) {
         } while ($mrc == CURLM_CALL_MULTI_PERFORM);
 
         while ($active && $mrc == CURLM_OK) {
-            if (curl_multi_select($multi_ch) != -1) {
-                do {
-                    $mrc = curl_multi_exec($multi_ch, $active);
-                } while ($mrc == CURLM_CALL_MULTI_PERFORM);
+            if (curl_multi_select($multi_ch) == -1) {
+                usleep(100);
             }
+            do {
+                $mrc = curl_multi_exec($multi_ch, $active);
+            } while ($mrc == CURLM_CALL_MULTI_PERFORM);
+            
         }
 
         // 获取结果