diff --git a/lib/cli-engine.js b/lib/cli-engine.js
index f68cda7cd..22237afba 100644
--- a/lib/cli-engine.js
+++ b/lib/cli-engine.js
@@ -11,11 +11,15 @@ var debug = require("debug")("text:cli-engine");
  * Process files are wanted to lint.
  * CLIEngine is wrapper of textlint.js.
  * Aim to be called from cli with cli options.
- * @param {object} options - cli option object
+ * @param {object|Config} options the options is command line options or Config object.
  * @constructor
  */
 function CLIEngine(options) {
-    this.config = new Config(options);
+    if (options instanceof Config) {
+        this.config = options;
+    } else {
+        this.config = new Config(options);
+    }
 }
 /**
  * filter files by config
diff --git a/lib/config/config.js b/lib/config/config.js
index 085a1cbe1..45ee01726 100644
--- a/lib/config/config.js
+++ b/lib/config/config.js
@@ -16,10 +16,13 @@ var defaultOptions = {
 /**
  * Create config object form command line options
  * See options.js
- * @param options the options is command line option object. @see options.js
+ * @param {object} options the options is command line option object. @see options.js
  * @constructor
  */
 function Config(options) {
+    if (typeof options !== "object") {
+        return this;
+    }
     this.extensions = options.ext ? options.ext : defaultOptions.extensions;
     this.rulePaths = options.rulesdir ? options.rulesdir : defaultOptions.rulePaths;
     this.formatName = options.format ? options.format : defaultOptions.formatName;
diff --git a/test/cli-engine-test.js b/test/cli-engine-test.js
index dbd89ef84..62fa8055f 100644
--- a/test/cli-engine-test.js
+++ b/test/cli-engine-test.js
@@ -6,6 +6,26 @@ var rulesDir = __dirname + "/fixtures/rules";
 var path = require("path");
 describe("cli-engine-test", function () {
     var cliEngine;
+    describe("Constructor", function () {
+        context("when args is object", function () {
+            it("should convert the object and set config", function () {
+                cliEngine = new CLIEngine({
+                    rulesdir: [rulesDir]
+                });
+                assert.deepEqual(cliEngine.config.rulePaths, [rulesDir]);
+            });
+        });
+        context("when args is Config object", function () {
+            it("should set directory to config", function () {
+                // Issue : when use Config as argus, have to export `../lib/config/config`
+                var Config = require("../lib/config/config");
+                var config = new Config();
+                config.rulePaths = [rulesDir];
+                cliEngine = new CLIEngine(config);
+                assert.deepEqual(cliEngine.config.rulePaths, [rulesDir]);
+            });
+        });
+    });
     describe("executeOnFiles", function () {
         beforeEach(function () {
             cliEngine = new CLIEngine({