diff --git a/.eslintrc b/.eslintrc
index 92e1562..14fa3fe 100644
--- a/.eslintrc
+++ b/.eslintrc
@@ -1,6 +1,12 @@
 {
+  "globals": {
+    "module": true,
+    "exports": true,
+    "process": true,
+    "child_process": true
+  },
   "ecmaFeatures": {
-    "jsx": true
+    "jsx": false
   },
   "parser": "espree",
   "env": {
diff --git a/bin/open-commander.js b/bin/open-commander.js
index 771d7be..91635ca 100644
--- a/bin/open-commander.js
+++ b/bin/open-commander.js
@@ -1,11 +1,10 @@
 'use strict';
 
-/* global module, process */
 var fs = require('fs');
 var path = require('path');
 var commander = require('commander');
-var child_process = require('child_process');
-var inquirer = require('inquirer');
+// var inquirer = require('inquirer');
+var gitremote = require('../lib/gitremote');
 
 // resolve absolute path to relative path base repository root.
 function resolve(filepath, cwd, root) {
@@ -154,33 +153,35 @@ module.exports = function(argv, option, callback) {
       };
     }
 
-    var RE_REMOTE_BRANCH_NAME = /^(\w+)\/(.+)/;
-    var cwd = commander.cwd || process.cwd();
-    var remoteBranches = child_process.execSync(
-        'git branch -r',
-        {cwd: cwd}
-      ).toString()
-      .trim()
-      .split(/\r\n|\r|\n/)
-      .map(function(branchName) { return branchName.trim(); })
-      .filter(function(branchName) {
-        return branchName.replace(RE_REMOTE_BRANCH_NAME, '$2') !== option.cwb &&
-          branchName.indexOf(' -> ') === -1; // `  origin/HEAD -> origin/master`
-      });
-
-    if (!options.args['branch-A'] && remoteBranches.length > 1) {
-      inquirer.prompt([{
-        name: 'remoteBranch',
-        type: 'list',
-        message: 'Choose remote brance to compare:',
-        choices: remoteBranches,
-      }]).then(function(answers) {
-        var br = answers.remoteBranch;
-        var m = RE_REMOTE_BRANCH_NAME.exec(br);
-        options.args['branch-A'] = m[2];
-        return callback(options);
-      });
-      return;
+    if (!options.args['branch-A']) {
+      var cwd = commander.cwd || process.cwd();
+      var remoteBranches = gitremote.getBaseBranches(cwd);
+      var remoteBranchLength = remoteBranches.length;
+      if (remoteBranchLength === 0) {
+        console.log('Not found base branch, rebase it before create PR/MR.');
+        return;
+        // remoteBranches = gitremote.getRemoteBranches(cwd)
+          // .map(function(br) {
+            // return br.name;
+          // })
+          // .filter(function(name) {
+            // return name !== option.cwb;
+          // });
+      }
+      // TODO: 目前这个分支走不到，后面获取所有的祖先分支列表时再供用户选择。
+      // if (remoteBranchLength > 1) {
+        // inquirer.prompt([{
+          // name: 'remoteBranch',
+          // type: 'list',
+          // message: 'Choose remote brance to compare:',
+          // choices: remoteBranches,
+        // }]).then(function(answers) {
+          // options.args['branch-A'] = answers.remoteBranch;
+          // return callback(options);
+        // });
+        // return;
+      // }
+      options.args['branch-A'] = remoteBranches[0];
     }
 
     break;
diff --git a/lib/gitremote.js b/lib/gitremote.js
index 6c10197..74f5517 100644
--- a/lib/gitremote.js
+++ b/lib/gitremote.js
@@ -46,3 +46,59 @@ exports.getGitRootPath = function(cwd) {
     return null;
   }
 };
+
+var RE_REMOTE_BRANCH_NAME = /^(\w+)\/(.+)/; // "origin/branch-name"
+exports.getRemoteBranches = function(cwd) {
+  var remoteBranches = child_process.execSync(
+      'git branch -r',
+      {cwd: cwd}
+    ).toString()
+    .trim()
+    .split(/\r\n|\r|\n/)
+    .filter(function(branchName) {
+      return branchName &&
+        branchName.indexOf(' -> ') === -1; // `  origin/HEAD -> origin/master`
+    })
+    .map(function(branchName) {
+      var br = branchName.trim();
+      var m = RE_REMOTE_BRANCH_NAME.exec(br);
+      return {
+        fullName: br,
+        remote: m[1],
+        name: m[2],
+      };
+    });
+  return remoteBranches;
+};
+
+var RE_CURRENT_BASE_BRANCHES = /^[ -+]*\*/;
+var RE_BASE_BRANCHE_NAME = /.*\[([^\]\^~]+).*/; // " +*   [MS170216105211~2^2] test: fixed lint"
+exports.getBaseBranches = function(cwd) {
+  var cwb = exports.getCurrentBranch(cwd);
+  var baseBranches = child_process.execSync(
+      'git show-branch --no-color',
+      {cwd: cwd}
+    ).toString()
+    .trim()
+    .split(/\r\n|\r|\n/)
+    .filter(function(line) {
+      return RE_CURRENT_BASE_BRANCHES.test(line);
+    })
+    .map(function(line) {
+      var m = RE_BASE_BRANCHE_NAME.exec(line);
+      return m ? m[1] : null;
+    })
+    .filter(function(branchName) {
+      return branchName !== cwb;
+    });
+  // TODO: 获取当前分支的所有祖先分支列表，并按照倒序排列，最近切出的祖先分支排第一。
+  return baseBranches.length >= 0 ? [baseBranches[0]] : [];
+  // return unique(baseBranches);
+};
+
+// function unique(array) {
+  // return array.filter(function(item, index) {
+    // var firstIndex = array.indexOf(item);
+    // return firstIndex === index;
+  // });
+// }