diff --git a/agentscope-core/src/main/java/io/agentscope/core/model/transport/JdkHttpTransport.java b/agentscope-core/src/main/java/io/agentscope/core/model/transport/JdkHttpTransport.java
index f65ef1638..a7f3f9cb7 100644
--- a/agentscope-core/src/main/java/io/agentscope/core/model/transport/JdkHttpTransport.java
+++ b/agentscope-core/src/main/java/io/agentscope/core/model/transport/JdkHttpTransport.java
@@ -102,6 +102,21 @@ public JdkHttpTransport(HttpClient client, HttpTransportConfig config) {
     }
 
     private static HttpClient buildClient(HttpTransportConfig config) {
+        // set connection pool for jdk http client
+        // refer:
+        // https://docs.oracle.com/en/java/javase/25/docs/api/java.net.http/module-summary.html
+        if (System.getProperty("jdk.httpclient.connectionPoolSize") == null) {
+            System.setProperty(
+                    "jdk.httpclient.connectionPoolSize",
+                    String.valueOf(config.getMaxIdleConnections()));
+        }
+
+        if (System.getProperty("jdk.httpclient.keepalive.timeout") == null) {
+            System.setProperty(
+                    "jdk.httpclient.keepalive.timeout",
+                    String.valueOf(config.getKeepAliveDuration().getSeconds()));
+        }
+
         HttpClient.Builder builder =
                 HttpClient.newBuilder()
                         .version(Version.HTTP_2)
diff --git a/agentscope-core/src/main/java/io/agentscope/core/model/transport/OkHttpTransport.java b/agentscope-core/src/main/java/io/agentscope/core/model/transport/OkHttpTransport.java
index 5e7afa5c8..03432d52c 100644
--- a/agentscope-core/src/main/java/io/agentscope/core/model/transport/OkHttpTransport.java
+++ b/agentscope-core/src/main/java/io/agentscope/core/model/transport/OkHttpTransport.java
@@ -111,10 +111,9 @@ private OkHttpClient buildClient(HttpTransportConfig config) {
             log.warn(
                     "SSL certificate verification is disabled. This is not recommended for"
                             + " production.");
-            builder =
-                    builder.sslSocketFactory(
-                                    createTrustAllSslSocketFactory(), createTrustAllTrustManager())
-                            .hostnameVerifier((hostname, session) -> true);
+
+            builder.sslSocketFactory(createTrustAllSslSocketFactory(), createTrustAllTrustManager())
+                    .hostnameVerifier((hostname, session) -> true);
         }
 
         return builder.build();
diff --git a/agentscope-core/src/test/java/io/agentscope/core/model/transport/JdkHttpTransportTest.java b/agentscope-core/src/test/java/io/agentscope/core/model/transport/JdkHttpTransportTest.java
index 61be6a692..bb9b5c99c 100644
--- a/agentscope-core/src/test/java/io/agentscope/core/model/transport/JdkHttpTransportTest.java
+++ b/agentscope-core/src/test/java/io/agentscope/core/model/transport/JdkHttpTransportTest.java
@@ -1047,4 +1047,35 @@ void testStreamNdJsonFormatWithoutHeaderDefaultsToSse() {
                         "{\"id\":\"2\",\"text\":\"World\"}") // This is sent before [DONE] marker
                 .verifyComplete();
     }
+
+    @Test
+    void testConnectionPoolSystemProperties() {
+        System.clearProperty("jdk.httpclient.connectionPoolSize");
+        System.clearProperty("jdk.httpclient.keepalive.timeout");
+        JdkHttpTransport.builder()
+                .config(
+                        HttpTransportConfig.builder()
+                                .maxIdleConnections(10)
+                                .keepAliveDuration(Duration.ofMinutes(5))
+                                .build())
+                .build();
+        assertEquals("10", System.getProperty("jdk.httpclient.connectionPoolSize"));
+        assertEquals("300", System.getProperty("jdk.httpclient.keepalive.timeout"));
+    }
+
+    @Test
+    void testConnectionPoolSystemPropertiesAlreadySet() {
+        System.setProperty("jdk.httpclient.connectionPoolSize", "5");
+        System.setProperty("jdk.httpclient.keepalive.timeout", "180");
+
+        JdkHttpTransport.builder()
+                .config(
+                        HttpTransportConfig.builder()
+                                .maxIdleConnections(10)
+                                .keepAliveDuration(Duration.ofMinutes(5))
+                                .build())
+                .build();
+        assertEquals("5", System.getProperty("jdk.httpclient.connectionPoolSize"));
+        assertEquals("180", System.getProperty("jdk.httpclient.keepalive.timeout"));
+    }
 }