diff --git a/README.md b/README.md
index 78c2165..3fd3c2a 100644
--- a/README.md
+++ b/README.md
@@ -608,6 +608,8 @@ interface Task {
 This tool only supports `application/json` type for request and response body. Any other type like `multipart/form` or `image/*` are **not supported** and will be ignored.
 
 ## Versions
+#### 2.1.2
+- Fix axios query of array type in IClientAPI (add `{arrayFormat: 'repeat'}`)
 #### 2.1.1
 - Fix axios type bug (`AxiosPromise` vs `Promise<AxiosResponse>`)
 #### 2.1.0
diff --git a/dist/codegen.js b/dist/codegen.js
index a620d33..11dd7b1 100644
--- a/dist/codegen.js
+++ b/dist/codegen.js
@@ -166,7 +166,7 @@ function codegenClientAPI(funcs, config, cp) {
     // axios
     cp.writeln('const $http = axios.create({', 1);
     cp.writeln('validateStatus: () => true,');
-    cp.writeln('paramsSerializer: params => qStringify(params),');
+    cp.writeln("paramsSerializer: params => qStringify(params, {arrayFormat: 'repeat'}),");
     cp.writeln('});', -1);
     // function
     cp.writeln('\nfunction urlReplacer(url: string, ' +
diff --git a/lib/codegen.ts b/lib/codegen.ts
index c52ca2d..c5a5bd9 100644
--- a/lib/codegen.ts
+++ b/lib/codegen.ts
@@ -171,7 +171,7 @@ function codegenClientAPI(funcs: APIFuncs, config: Config, cp: CodePrinter) {
   // axios
   cp.writeln('const $http = axios.create({', 1);
   cp.writeln('validateStatus: () => true,');
-  cp.writeln('paramsSerializer: params => qStringify(params),');
+  cp.writeln(`paramsSerializer: params => qStringify(params, {arrayFormat: 'repeat'}),`);
   cp.writeln('});', -1);
   // function
   cp.writeln('\nfunction urlReplacer(url: string, ' +
diff --git a/package.json b/package.json
index 1f5de30..e83c4ef 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@sup39/api-ts-gen",
-  "version": "2.1.1-rc",
+  "version": "2.1.2",
   "description": "OpenAPI code generator for TypeScript",
   "main": "dist/lib/index.js",
   "types": "dist/lib/index.d.ts",