diff --git a/apollo-openapi/src/main/java/com/ctrip/framework/apollo/openapi/client/url/OpenApiPathBuilder.java b/apollo-openapi/src/main/java/com/ctrip/framework/apollo/openapi/client/url/OpenApiPathBuilder.java
index 72c94b07..ceaaab7f 100644
--- a/apollo-openapi/src/main/java/com/ctrip/framework/apollo/openapi/client/url/OpenApiPathBuilder.java
+++ b/apollo-openapi/src/main/java/com/ctrip/framework/apollo/openapi/client/url/OpenApiPathBuilder.java
@@ -27,6 +27,7 @@
 import java.util.Arrays;
 import java.util.Base64;
 import java.util.HashMap;
+import java.util.LinkedHashMap;
 import java.util.List;
 import java.util.Map;
 
@@ -60,7 +61,7 @@ public static OpenApiPathBuilder newBuilder() {
 
   private OpenApiPathBuilder() {
     this.pathVariable = new HashMap<>();
-    this.params = new HashMap<>();
+    this.params = new LinkedHashMap<>();
   }
 
   public OpenApiPathBuilder envPathVal(String env) {
diff --git a/apollo-openapi/src/test/java/com/ctrip/framework/apollo/openapi/client/service/ItemOpenApiServiceTest.java b/apollo-openapi/src/test/java/com/ctrip/framework/apollo/openapi/client/service/ItemOpenApiServiceTest.java
index 81a24bc3..68aa235c 100644
--- a/apollo-openapi/src/test/java/com/ctrip/framework/apollo/openapi/client/service/ItemOpenApiServiceTest.java
+++ b/apollo-openapi/src/test/java/com/ctrip/framework/apollo/openapi/client/service/ItemOpenApiServiceTest.java
@@ -318,8 +318,8 @@ public void testFindItemsByNamespace() throws Exception {
 
     HttpGet get = request.getValue();
 
-    assertEquals(String.format("%s/envs/%s/apps/%s/clusters/%s/namespaces/%s/items?size=%s&page=%s",
-            someBaseUrl, someEnv, someAppId, someCluster, someNamespace, size, page), get.getURI().toString());
+    assertEquals(String.format("%s/envs/%s/apps/%s/clusters/%s/namespaces/%s/items?page=%s&size=%s",
+            someBaseUrl, someEnv, someAppId, someCluster, someNamespace, page, size), get.getURI().toString());
   }
 
   @Test(expected = RuntimeException.class)