diff --git a/README.md b/README.md
index a51cd55..23b4c71 100644
--- a/README.md
+++ b/README.md
@@ -205,7 +205,7 @@ git flow feature finish upgrade-mirror
 ### v1.0
 
 - [x] Travis Testing
-- [ ] Asynchronous redux-form validation (detect duplicate username/email)
+- [x] Asynchronous redux-form validation (detect duplicate email)
 - [ ] Pagination Mechanism
 
 ### v1.0+
diff --git a/src/common/actions/formActions.js b/src/common/actions/formActions.js
new file mode 100644
index 0000000..0e38c5f
--- /dev/null
+++ b/src/common/actions/formActions.js
@@ -0,0 +1,17 @@
+import formAPI from '../api/form';
+import { pushErrors } from '../actions/errorActions';
+
+export const validateForm = (formName, fieldName, value) => {
+  return (dispatch, getState) => {
+    return formAPI(getState().apiEngine)
+      .form(formName)
+      .field(fieldName, value)
+      .validate()
+      .catch((err) => {
+        let validationError = {};
+        dispatch(pushErrors(err));
+        validationError[fieldName] = 'Unable to validate';
+        throw validationError;
+      });
+  };
+};
diff --git a/src/common/api/form.js b/src/common/api/form.js
new file mode 100644
index 0000000..52ea619
--- /dev/null
+++ b/src/common/api/form.js
@@ -0,0 +1,11 @@
+export default (apiEngine) => ({
+  form: (formName) => ({
+    field: (fieldName, value) => ({
+      validate: () => apiEngine.post(
+        `/api/forms/${formName}/fields/${fieldName}/validation`, {
+          data: { value },
+        }
+      ),
+    }),
+  }),
+});
diff --git a/src/common/components/forms/RegisterForm.js b/src/common/components/forms/RegisterForm.js
index 33fd3a0..eeab539 100644
--- a/src/common/components/forms/RegisterForm.js
+++ b/src/common/components/forms/RegisterForm.js
@@ -3,6 +3,7 @@ import { Field, reduxForm } from 'redux-form';
 import Button from 'react-bootstrap/lib/Button';
 // import validator from 'validator';
 import userAPI from '../../api/user';
+import { validateForm } from '../../actions/formActions';
 import { pushErrors } from '../../actions/errorActions';
 import { Form, FormField, FormFooter } from '../utils/BsForm';
 
@@ -24,6 +25,17 @@ const validate = (values) => {
   return errors;
 };
 
+let asyncValidate = (values, dispatch) => {
+  return dispatch(validateForm('register', 'email', values.email))
+    .then((json) => {
+      let validationError = {};
+      if (!json.isPassed) {
+        validationError.email = json.message;
+        throw validationError;
+      }
+    });
+};
+
 class RegisterForm extends Component {
   constructor(props) {
     super(props);
@@ -46,6 +58,7 @@ class RegisterForm extends Component {
     const {
       handleSubmit,
       pristine,
+      asyncValidating,
       submitting,
       invalid,
     } = this.props;
@@ -74,7 +87,10 @@ class RegisterForm extends Component {
           placeholder="Password"
         />
         <FormFooter>
-          <Button type="submit" disabled={pristine || submitting || invalid}>
+          <Button
+            type="submit"
+            disabled={pristine || !!asyncValidating || submitting || invalid}
+          >
             Register
           </Button>
         </FormFooter>
@@ -91,4 +107,6 @@ RegisterForm.contextTypes = {
 export default reduxForm({
   form: 'register',
   validate,
+  asyncValidate,
+  asyncBlurFields: ['email'],
 })(RegisterForm);
diff --git a/src/server/controllers/formValidation.js b/src/server/controllers/formValidation.js
new file mode 100644
index 0000000..b4f1631
--- /dev/null
+++ b/src/server/controllers/formValidation.js
@@ -0,0 +1,23 @@
+import { handleDbError } from '../decorators/handleError';
+import User from '../models/User';
+
+export default {
+  register: {
+    email(req, res) {
+      User.findOne({
+        'email.value': req.body.value,
+      }, handleDbError(res)((user) => {
+        if (user) {
+          res.json({
+            isPassed: false,
+            message: 'The email is already registered',
+          });
+        } else {
+          res.json({
+            isPassed: true,
+          });
+        }
+      }));
+    },
+  },
+};
diff --git a/src/server/routes/api.js b/src/server/routes/api.js
index 574969d..97740fe 100644
--- a/src/server/routes/api.js
+++ b/src/server/routes/api.js
@@ -3,6 +3,7 @@ import bodyParser from '../middlewares/bodyParser';
 import authRequired from '../middlewares/authRequired';
 import fileUpload from '../middlewares/fileUpload';
 import userController from '../controllers/user';
+import formValidationController from '../controllers/formValidation';
 import localeController from '../controllers/locale';
 import todoController from '../controllers/todo';
 
@@ -24,6 +25,10 @@ export default ({ app }) => {
       filename: 'avatar.jpg',
     }).single('avatar'),
     userController.uploadAvatar);
+  app.post('/api/forms/register/fields/email/validation',
+    bodyParser.json,
+    formValidationController.register.email
+  );
   app.get('/api/locale/:locale', localeController.show);
   app.post('/api/todo', bodyParser.json, todoController.create);
   app.get('/api/todo', todoController.list);