diff --git a/README.md b/README.md
index 7243b9f..e1dd143 100644
--- a/README.md
+++ b/README.md
@@ -92,6 +92,13 @@ app.use(async (ctx, next) => {
 app.use(bodyparser());
 ```
 
+## Raw Body
+
+You can access raw request body by `ctx.request.rawBody` after `koa-bodyparser` when:
+
+1. `koa-bodyparser` parsed the request body.
+2. `ctx.request.rawBody` is not present before `koa-bodyparser`.
+
 ## Koa 1 Support
 
 To use `koa-bodyparser` with koa@1, please use [bodyparser 2.x](https://github.com/koajs/bodyparser/tree/2.x).
diff --git a/index.js b/index.js
index 5f2f91c..51e57f1 100644
--- a/index.js
+++ b/index.js
@@ -38,6 +38,9 @@ module.exports = function (opts) {
   opts.detectJSON = undefined;
   opts.onerror = undefined;
 
+  // force co-body return raw body
+  opts.returnRawBody = true;
+
   // default json types
   var jsonTypes = [
     'application/json',
@@ -70,7 +73,9 @@ module.exports = function (opts) {
     if (ctx.request.body !== undefined) return await next();
     if (ctx.disableBodyParser) return await next();
     try {
-      ctx.request.body = await parseBody(ctx);
+      const res = await parseBody(ctx);
+      ctx.request.body = 'parsed' in res ? res.parsed : {};
+      if (ctx.request.rawBody === undefined) ctx.request.rawBody = res.raw;
     } catch (err) {
       if (onerror) {
         onerror(err, ctx);
diff --git a/package.json b/package.json
index 282d71f..3193e1f 100644
--- a/package.json
+++ b/package.json
@@ -35,7 +35,7 @@
     "supertest": "^3.0.0"
   },
   "dependencies": {
-    "co-body": "^5.0.0",
+    "co-body": "^5.1.0",
     "copy-to": "^2.0.1"
   },
   "engines": {
diff --git a/test/middleware.test.js b/test/middleware.test.js
index bfff2f0..13f029a 100644
--- a/test/middleware.test.js
+++ b/test/middleware.test.js
@@ -25,7 +25,10 @@ var fixtures = path.join(__dirname, 'fixtures');
 
 describe('test/middleware.test.js', function () {
   describe('json body', function () {
-    var app = App();
+    var app;
+    beforeEach(function() {
+      app = App();
+    });
 
     it('should parse json body ok', function (done) {
       // should work when use body parser again
@@ -33,6 +36,7 @@ describe('test/middleware.test.js', function () {
 
       app.use(async (ctx) => {
         ctx.request.body.should.eql( {foo: 'bar'} );
+        ctx.request.rawBody.should.equal('{"foo":"bar"}');
         ctx.body = ctx.request.body;
       });
       request(app.listen())
@@ -47,6 +51,7 @@ describe('test/middleware.test.js', function () {
 
       app.use(async (ctx) => {
         ctx.request.body.should.eql( {foo: 'bar'} );
+        ctx.request.rawBody.should.equal('{"foo": "bar"}');
         ctx.body = ctx.request.body;
       });
       request(app.listen())
@@ -61,6 +66,7 @@ describe('test/middleware.test.js', function () {
       var app = App();
       app.use(async (ctx) => {
         ctx.request.body.should.eql( [{op: 'add', path: '/foo', value: 'bar'}] );
+        ctx.request.rawBody.should.equal('[{"op": "add", "path": "/foo", "value": "bar"}]');
         ctx.body = ctx.request.body;
       });
       request(app.listen())
@@ -84,6 +90,7 @@ describe('test/middleware.test.js', function () {
     it('should json body error with string in strict mode', function (done) {
       var app = App({jsonLimit: 100});
       app.use(async (ctx) => {
+        ctx.request.rawBody.should.equal('"invalid"');
         ctx.body = ctx.request.body;
       });
       request(app.listen())
@@ -96,6 +103,7 @@ describe('test/middleware.test.js', function () {
     it('should json body ok with string not in strict mode', function (done) {
       var app = App({jsonLimit: 100, strict: false});
       app.use(async (ctx) => {
+        ctx.request.rawBody.should.equal('"valid"');
         ctx.body = ctx.request.body;
       });
       request(app.listen())
@@ -116,6 +124,7 @@ describe('test/middleware.test.js', function () {
 
         app.use(async (ctx) => {
           ctx.request.body.should.eql( {foo: 'bar'} );
+          ctx.request.rawBody.should.equal('{"foo":"bar"}');
           ctx.body = ctx.request.body;
         });
 
@@ -133,6 +142,7 @@ describe('test/middleware.test.js', function () {
         });
 
         app.use(async (ctx) => {
+          ctx.request.rawBody.should.equal('{"foo":"bar"}');
           ctx.body = ctx.request.body;
         });
 
@@ -150,6 +160,7 @@ describe('test/middleware.test.js', function () {
     it('should parse form body ok', function (done) {
       app.use(async (ctx) => {
         ctx.request.body.should.eql( { foo: {bar: 'baz'} } );
+        ctx.request.rawBody.should.equal('foo%5Bbar%5D=baz');
         ctx.body = ctx.request.body;
       });
       request(app.listen())
@@ -176,6 +187,7 @@ describe('test/middleware.test.js', function () {
       });
       app.use(async (ctx) => {
         ctx.request.body.should.equal('body');
+        ctx.request.rawBody.should.equal('body');
         ctx.body = ctx.request.body;
       });
       request(app.listen())
@@ -293,6 +305,7 @@ describe('test/middleware.test.js', function () {
       });
       app.use(bodyParser());
       app.use(async (ctx) => {
+        (undefined === ctx.request.rawBody).should.equal(true);
         ctx.body = ctx.request.body ? 'parsed' : 'empty';
       });
       request(app.listen())