diff --git a/lib/loader/mixin/plugin.js b/lib/loader/mixin/plugin.js
index c7a9bc9c..4fead235 100644
--- a/lib/loader/mixin/plugin.js
+++ b/lib/loader/mixin/plugin.js
@@ -148,6 +148,13 @@ module.exports = {
       configPaths = [ configPaths ];
     }
 
+    // read plugin.js and plugins.${env}.js
+    // note: can't use for-of
+    for (let i = 0, l = configPaths.length; i < l; i++) {
+      const configPath = configPaths[i];
+      configPaths.push(configPath.replace(/plugin.js$/, `plugin.${this.serverEnv}.js`));
+    }
+
     const plugins = {};
     for (const configPath of configPaths) {
       if (!fs.existsSync(configPath)) {
diff --git a/test/fixtures/load-plugin-by-env/config/plugin.custom.js b/test/fixtures/load-plugin-by-env/config/plugin.custom.js
new file mode 100644
index 00000000..46419f0a
--- /dev/null
+++ b/test/fixtures/load-plugin-by-env/config/plugin.custom.js
@@ -0,0 +1,8 @@
+'use strict';
+
+const path = require('path');
+
+exports.c = {
+  enable: true,
+  path: path.join(__dirname, '../plugins/c'),
+}
diff --git a/test/fixtures/load-plugin-by-env/config/plugin.js b/test/fixtures/load-plugin-by-env/config/plugin.js
new file mode 100644
index 00000000..ef9b5024
--- /dev/null
+++ b/test/fixtures/load-plugin-by-env/config/plugin.js
@@ -0,0 +1,8 @@
+'use strict';
+
+const path = require('path');
+
+exports.a = {
+  enable: true,
+  path: path.join(__dirname, '../plugins/a'),
+}
diff --git a/test/fixtures/load-plugin-by-env/config/plugin.unittest.js b/test/fixtures/load-plugin-by-env/config/plugin.unittest.js
new file mode 100644
index 00000000..1fefc15b
--- /dev/null
+++ b/test/fixtures/load-plugin-by-env/config/plugin.unittest.js
@@ -0,0 +1,10 @@
+'use strict';
+
+const path = require('path');
+
+exports.a = false;
+
+exports.b = {
+  enable: true,
+  path: path.join(__dirname, '../plugins/b'),
+}
diff --git a/test/fixtures/load-plugin-by-env/package.json b/test/fixtures/load-plugin-by-env/package.json
new file mode 100644
index 00000000..2b4addd6
--- /dev/null
+++ b/test/fixtures/load-plugin-by-env/package.json
@@ -0,0 +1,3 @@
+{
+  "name": "load-plugin-by-env"
+}
diff --git a/test/fixtures/load-plugin-by-env/plugins/a/package.json b/test/fixtures/load-plugin-by-env/plugins/a/package.json
new file mode 100644
index 00000000..0993be8f
--- /dev/null
+++ b/test/fixtures/load-plugin-by-env/plugins/a/package.json
@@ -0,0 +1,5 @@
+{
+  "eggPlugin": {
+    "name": "a"
+  }
+}
diff --git a/test/fixtures/load-plugin-by-env/plugins/b/package.json b/test/fixtures/load-plugin-by-env/plugins/b/package.json
new file mode 100644
index 00000000..09dc2b7d
--- /dev/null
+++ b/test/fixtures/load-plugin-by-env/plugins/b/package.json
@@ -0,0 +1,5 @@
+{
+  "eggPlugin": {
+    "name": "b"
+  }
+}
diff --git a/test/fixtures/load-plugin-by-env/plugins/c/package.json b/test/fixtures/load-plugin-by-env/plugins/c/package.json
new file mode 100644
index 00000000..2df18dea
--- /dev/null
+++ b/test/fixtures/load-plugin-by-env/plugins/c/package.json
@@ -0,0 +1,5 @@
+{
+  "eggPlugin": {
+    "name": "c"
+  }
+}
diff --git a/test/loader/mixin/load_plugin.test.js b/test/loader/mixin/load_plugin.test.js
index 3e394800..9cf5e9d3 100644
--- a/test/loader/mixin/load_plugin.test.js
+++ b/test/loader/mixin/load_plugin.test.js
@@ -386,4 +386,23 @@ describe('test/load_plugin.test.js', function() {
     loader.plugins.a.from.should.equal(utils.getFilepath('plugin-from/config/plugin.js'));
     loader.plugins.b.from.should.equal(utils.getFilepath('plugin-from/framework/config/plugin.js'));
   });
+
+  it('should load plugin.unittest.js override default', function() {
+    mm(process.env, 'EGG_SERVER_ENV', 'unittest');
+    app = utils.createApp('load-plugin-by-env');
+    const loader = app.loader;
+    loader.loadPlugin();
+    loader.allPlugins.a.enable.should.be.false();
+    loader.allPlugins.b.enable.should.be.true();
+  });
+
+  it('should load plugin.custom.js when env is custom', function() {
+    mm(process.env, 'EGG_SERVER_ENV', 'custom');
+    app = utils.createApp('load-plugin-by-env');
+    const loader = app.loader;
+    loader.loadPlugin();
+    loader.allPlugins.a.enable.should.be.true();
+    should.not.exists(loader.allPlugins.b);
+    loader.allPlugins.c.enable.should.be.true();
+  });
 });