diff --git a/src/compilerServices/clangService.ts b/src/compilerServices/clangService.ts
index 43eea7596..e03eaa4dd 100644
--- a/src/compilerServices/clangService.ts
+++ b/src/compilerServices/clangService.ts
@@ -31,23 +31,26 @@ export class ClangService implements CompilerService {
 
   async compile(input: ServiceInput): Promise<ServiceOutput> {
     const files = Object.values(input.files);
-    if (files.length !== 1) {
-      throw new Error(`Supporting compilation of a single file, but ${files.length} file(s) found`);
-    }
     const [ fileRef ] = Object.keys(input.files);
-    const src = files[0].content;
     const from = this.lang;
+    const inputFile=Object.keys(input.files);
+    const File = function(inputFile:any,file:any){
+      const compileFile =[];
+      for(let i=0;i<inputFile.length;i++){
+        const f={
+          type:inputFile[i].split("/")[1].split(".")[1],
+          name:inputFile[i].split("/")[1],
+          options:input.options,
+          src:files[i].content,
+        }
+        compileFile.push(f);
+      }
+      return compileFile;
+    };
     const project = {
       output: "wasm",
       compress: true,
-      files: [
-        {
-          type: from,
-          name: "file." + from,
-          options: input.options,
-          src
-        }
-      ]
+      files:File(inputFile,files)
     };
     const result = await sendRequestJSON(project, ServiceTypes.Clang);
     const items: any = {};
diff --git a/src/compilerServices/types.ts b/src/compilerServices/types.ts
index 0679e772f..f2a4c861a 100644
--- a/src/compilerServices/types.ts
+++ b/src/compilerServices/types.ts
@@ -30,7 +30,9 @@ export enum Language {
   JavaScript = "javascript",
   TypeScript = "typescript",
   Toml = "toml",
-  Text = "text"
+  Text = "text",
+  h = "h",
+  hpp = "hpp"
 }
 
 export interface InputFile {
diff --git a/src/service.ts b/src/service.ts
index 58e8e26c4..414ce1539 100644
--- a/src/service.ts
+++ b/src/service.ts
@@ -61,7 +61,8 @@ export { Language } from "./compilerServices";
 
 function getProjectFilePath(file: File): string {
   const project = file.getProject();
-  return file.getPath(project);
+  const result = file.getPath(project);
+  return result;
 }
 
 export class ServiceWorker {
@@ -197,18 +198,17 @@ export class Service {
     return annotations;
   }
 
-  static async compileFiles(files: File[], from: Language, to: Language, options = ""): Promise<{ [name: string]: (string|ArrayBuffer); }> {
+  static async compileFiles(files: Array<any>, from: Language, to: Language, options = ""): Promise<{ [name: string]: (string|ArrayBuffer); }> {
     gaEvent("compile", "Service", `${from}->${to}`);
 
     const service = await createCompilerService(from, to);
-
-    const fileNameMap: {[name: string]: File} = files.reduce((acc: any, f: File) => {
+    const fileNameMap: {[name: string]: File} = files[0].reduce((acc: any, f: any) => {
       acc[getProjectFilePath(f)] = f;
       return acc;
     }, {} as any);
 
     const input = {
-      files: files.reduce((acc: any, f: File) => {
+      files: files[0].reduce((acc: any, f: File) => {
         acc[getProjectFilePath(f)] = {
           content: f.getData(),
         };
@@ -218,7 +218,7 @@ export class Service {
     };
     const result = await service.compile(input);
 
-    for (const file of files) {
+    for (const file of files[0]) {
       file.setProblems([]);
     }
 
diff --git a/templates/hello_world_c/build.ts b/templates/hello_world_c/build.ts
index 626bb3aad..f7249addf 100644
--- a/templates/hello_world_c/build.ts
+++ b/templates/hello_world_c/build.ts
@@ -2,7 +2,7 @@ import * as gulp from "gulp";
 import { Service, project } from "@wasm/studio-utils";
 
 gulp.task("build", async () => {
-  const data = await Service.compileFile(project.getFile("src/main.c"), "c", "wasm", "-g -O3");
+  const data = await Service.compileFile([project.getFile("src/main.c"),project.getFile("src/header.h")], "c", "wasm", "-g -O3");
   const outWasm = project.newFile("out/main.wasm", "wasm", true);
   outWasm.setData(data);
 });
diff --git a/templates/hello_world_c/src/header.h b/templates/hello_world_c/src/header.h
new file mode 100644
index 000000000..63063556d
--- /dev/null
+++ b/templates/hello_world_c/src/header.h
@@ -0,0 +1,3 @@
+int hello(int a,int b){
+return a+b;
+}
diff --git a/templates/hello_world_c/src/main.c b/templates/hello_world_c/src/main.c
index 241126fc9..a02cb79e3 100644
--- a/templates/hello_world_c/src/main.c
+++ b/templates/hello_world_c/src/main.c
@@ -1,10 +1,13 @@
 #include <stdio.h>
 #include <sys/uio.h>
+#include "header.h"
 
 #define WASM_EXPORT __attribute__((visibility("default")))
 
 WASM_EXPORT
 int main(void) {
+  int c= hello(3,2);//you can define any function in headerfile and use it here.It is just an example.
+  printf("%d",c);
   printf("Hello World\n");
 }