diff --git a/framework/yii/BaseYii.php b/framework/yii/BaseYii.php
index 21dc81cb9f..5d546bdba9 100644
--- a/framework/yii/BaseYii.php
+++ b/framework/yii/BaseYii.php
@@ -6,7 +6,6 @@
  */
 namespace yii;
 
-use yii\base\Exception;
 use yii\base\InvalidConfigException;
 use yii\base\InvalidParamException;
 use yii\base\UnknownClassException;
diff --git a/framework/yii/base/Theme.php b/framework/yii/base/Theme.php
index d21d4bf1fa..ff6780cbc9 100644
--- a/framework/yii/base/Theme.php
+++ b/framework/yii/base/Theme.php
@@ -8,7 +8,6 @@
 namespace yii\base;
 
 use Yii;
-use yii\base\InvalidConfigException;
 use yii\helpers\FileHelper;
 
 /**
diff --git a/framework/yii/bootstrap/Widget.php b/framework/yii/bootstrap/Widget.php
index db7f415bee..ff4084d258 100644
--- a/framework/yii/bootstrap/Widget.php
+++ b/framework/yii/bootstrap/Widget.php
@@ -8,7 +8,6 @@
 namespace yii\bootstrap;
 
 use Yii;
-use yii\base\View;
 use yii\helpers\Json;
 
 /**
diff --git a/framework/yii/gii/generators/crud/Generator.php b/framework/yii/gii/generators/crud/Generator.php
index 671dfbde08..cb4bce6b9a 100644
--- a/framework/yii/gii/generators/crud/Generator.php
+++ b/framework/yii/gii/generators/crud/Generator.php
@@ -8,7 +8,6 @@
 namespace yii\gii\generators\crud;
 
 use Yii;
-use yii\base\Model;
 use yii\db\ActiveRecord;
 use yii\db\Schema;
 use yii\gii\CodeFile;
diff --git a/framework/yii/gii/views/default/view.php b/framework/yii/gii/views/default/view.php
index 1ef5c77662..3123b57685 100644
--- a/framework/yii/gii/views/default/view.php
+++ b/framework/yii/gii/views/default/view.php
@@ -1,6 +1,5 @@
 <?php
 
-use yii\gii\Generator;
 use yii\helpers\Html;
 use yii\widgets\ActiveForm;
 use yii\gii\components\ActiveField;
diff --git a/framework/yii/gii/views/default/view/files.php b/framework/yii/gii/views/default/view/files.php
index 0cc12dd416..af61a02155 100644
--- a/framework/yii/gii/views/default/view/files.php
+++ b/framework/yii/gii/views/default/view/files.php
@@ -1,6 +1,5 @@
 <?php
 
-use yii\gii\Generator;
 use yii\helpers\Html;
 use yii\gii\CodeFile;
 
diff --git a/framework/yii/gii/views/default/view/results.php b/framework/yii/gii/views/default/view/results.php
index b37543fb05..e506a4ec38 100644
--- a/framework/yii/gii/views/default/view/results.php
+++ b/framework/yii/gii/views/default/view/results.php
@@ -1,8 +1,4 @@
 <?php
-
-use yii\gii\Generator;
-use yii\gii\CodeFile;
-
 /**
  * @var yii\base\View $this
  * @var yii\gii\Generator $generator
diff --git a/framework/yii/grid/ActionColumn.php b/framework/yii/grid/ActionColumn.php
index 598457f4c3..794198e35d 100644
--- a/framework/yii/grid/ActionColumn.php
+++ b/framework/yii/grid/ActionColumn.php
@@ -10,8 +10,6 @@ namespace yii\grid;
 use Yii;
 use Closure;
 use yii\helpers\Html;
-use yii\helpers\Inflector;
-use yii\helpers\StringHelper;
 
 /**
  * @author Qiang Xue <qiang.xue@gmail.com>
diff --git a/framework/yii/grid/GridView.php b/framework/yii/grid/GridView.php
index 4895781ec1..8a3196b9d9 100644
--- a/framework/yii/grid/GridView.php
+++ b/framework/yii/grid/GridView.php
@@ -11,8 +11,6 @@ use Yii;
 use Closure;
 use yii\base\Formatter;
 use yii\base\InvalidConfigException;
-use yii\base\Widget;
-use yii\db\ActiveRecord;
 use yii\helpers\Html;
 use yii\helpers\Json;
 use yii\widgets\BaseListView;
diff --git a/framework/yii/i18n/I18N.php b/framework/yii/i18n/I18N.php
index 57978a09ae..bf749a295e 100644
--- a/framework/yii/i18n/I18N.php
+++ b/framework/yii/i18n/I18N.php
@@ -10,7 +10,6 @@ namespace yii\i18n;
 use Yii;
 use yii\base\Component;
 use yii\base\InvalidConfigException;
-use yii\log\Logger;
 
 /**
  * I18N provides features related with internationalization (I18N) and localization (L10N).
diff --git a/framework/yii/web/YiiAsset.php b/framework/yii/web/YiiAsset.php
index 29796e73bc..e49082d9d5 100644
--- a/framework/yii/web/YiiAsset.php
+++ b/framework/yii/web/YiiAsset.php
@@ -7,9 +7,6 @@
 
 namespace yii\web;
 
-use Yii;
-use yii\base\View;
-
 /**
  * @author Qiang Xue <qiang.xue@gmail.com>
  * @since 2.0
diff --git a/framework/yii/widgets/ActiveField.php b/framework/yii/widgets/ActiveField.php
index b8924bd3b2..fc30af5850 100644
--- a/framework/yii/widgets/ActiveField.php
+++ b/framework/yii/widgets/ActiveField.php
@@ -8,7 +8,6 @@ namespace yii\widgets;
 
 use Yii;
 use yii\base\Component;
-use yii\db\ActiveRecord;
 use yii\helpers\ArrayHelper;
 use yii\helpers\Html;
 use yii\base\Model;
diff --git a/tests/unit/data/ar/ActiveRecord.php b/tests/unit/data/ar/ActiveRecord.php
index f1194eaad9..bcb5b48377 100644
--- a/tests/unit/data/ar/ActiveRecord.php
+++ b/tests/unit/data/ar/ActiveRecord.php
@@ -7,8 +7,6 @@
 
 namespace yiiunit\data\ar;
 
-use yii\db\Connection;
-
 /**
  * ActiveRecord is ...
  *
diff --git a/tests/unit/framework/caching/CacheTestCase.php b/tests/unit/framework/caching/CacheTestCase.php
index 9ff64090f8..2952e878b2 100644
--- a/tests/unit/framework/caching/CacheTestCase.php
+++ b/tests/unit/framework/caching/CacheTestCase.php
@@ -13,7 +13,6 @@ function time()
 
 namespace yiiunit\framework\caching;
 
-use yii\helpers\StringHelper;
 use yiiunit\TestCase;
 use yii\caching\Cache;
 
diff --git a/tests/unit/framework/caching/RedisCacheTest.php b/tests/unit/framework/caching/RedisCacheTest.php
index d4e414e2ac..b9df7a9ab5 100644
--- a/tests/unit/framework/caching/RedisCacheTest.php
+++ b/tests/unit/framework/caching/RedisCacheTest.php
@@ -2,7 +2,6 @@
 namespace yiiunit\framework\caching;
 use yii\caching\MemCache;
 use yii\caching\RedisCache;
-use yiiunit\TestCase;
 
 /**
  * Class for testing redis cache backend
diff --git a/tests/unit/framework/caching/ZendDataCacheTest.php b/tests/unit/framework/caching/ZendDataCacheTest.php
index 96354cd646..2a0af9fa2d 100644
--- a/tests/unit/framework/caching/ZendDataCacheTest.php
+++ b/tests/unit/framework/caching/ZendDataCacheTest.php
@@ -1,7 +1,6 @@
 <?php
 namespace yiiunit\framework\caching;
 
-use yii\caching\Cache;
 use yii\caching\ZendDataCache;
 
 /**
diff --git a/tests/unit/framework/db/ActiveRecordTest.php b/tests/unit/framework/db/ActiveRecordTest.php
index 5e20edb6af..eb9d4250f2 100644
--- a/tests/unit/framework/db/ActiveRecordTest.php
+++ b/tests/unit/framework/db/ActiveRecordTest.php
@@ -1,7 +1,6 @@
 <?php
 namespace yiiunit\framework\db;
 
-use yii\db\Query;
 use yii\db\ActiveQuery;
 use yiiunit\data\ar\ActiveRecord;
 use yiiunit\data\ar\Customer;
diff --git a/tests/unit/framework/db/CommandTest.php b/tests/unit/framework/db/CommandTest.php
index da3d5577f5..64eb2df0e7 100644
--- a/tests/unit/framework/db/CommandTest.php
+++ b/tests/unit/framework/db/CommandTest.php
@@ -2,9 +2,6 @@
 
 namespace yiiunit\framework\db;
 
-use yii\db\Connection;
-use yii\db\Command;
-use yii\db\Query;
 use yii\db\DataReader;
 
 /**
diff --git a/tests/unit/framework/db/QueryTest.php b/tests/unit/framework/db/QueryTest.php
index 5cb019ea03..a48d719cff 100644
--- a/tests/unit/framework/db/QueryTest.php
+++ b/tests/unit/framework/db/QueryTest.php
@@ -2,10 +2,7 @@
 
 namespace yiiunit\framework\db;
 
-use yii\db\Connection;
-use yii\db\Command;
 use yii\db\Query;
-use yii\db\DataReader;
 
 /**
  * @group db
diff --git a/tests/unit/framework/db/cubrid/CubridQueryBuilderTest.php b/tests/unit/framework/db/cubrid/CubridQueryBuilderTest.php
index a2e1135a4c..5fe6e4570c 100644
--- a/tests/unit/framework/db/cubrid/CubridQueryBuilderTest.php
+++ b/tests/unit/framework/db/cubrid/CubridQueryBuilderTest.php
@@ -2,7 +2,6 @@
 
 namespace yiiunit\framework\db\cubrid;
 
-use yii\base\NotSupportedException;
 use yii\db\sqlite\Schema;
 use yiiunit\framework\db\QueryBuilderTest;
 
diff --git a/tests/unit/framework/i18n/GettextMessageSourceTest.php b/tests/unit/framework/i18n/GettextMessageSourceTest.php
index 5c10ff2ae1..727fee9ead 100644
--- a/tests/unit/framework/i18n/GettextMessageSourceTest.php
+++ b/tests/unit/framework/i18n/GettextMessageSourceTest.php
@@ -2,7 +2,6 @@
 
 namespace yiiunit\framework\i18n;
 
-use yii\i18n\GettextMessageSource;
 use yiiunit\TestCase;
 
 /**
diff --git a/tests/unit/framework/i18n/I18NTest.php b/tests/unit/framework/i18n/I18NTest.php
index 924176fdae..65d3d11b31 100644
--- a/tests/unit/framework/i18n/I18NTest.php
+++ b/tests/unit/framework/i18n/I18NTest.php
@@ -9,7 +9,6 @@ namespace yiiunit\framework\i18n;
 
 use yii\base\Model;
 use yii\i18n\I18N;
-use yii\i18n\MessageFormatter;
 use yii\i18n\PhpMessageSource;
 use yiiunit\TestCase;
 
diff --git a/tests/unit/framework/validators/UniqueValidatorTest.php b/tests/unit/framework/validators/UniqueValidatorTest.php
index 37d666f981..81b5236dbe 100644
--- a/tests/unit/framework/validators/UniqueValidatorTest.php
+++ b/tests/unit/framework/validators/UniqueValidatorTest.php
@@ -10,7 +10,6 @@ use yiiunit\data\validators\models\FakedValidationModel;
 use yiiunit\data\validators\models\ValidatorTestMainModel;
 use yiiunit\data\validators\models\ValidatorTestRefModel;
 use yiiunit\framework\db\DatabaseTestCase;
-use yiiunit\TestCase;
 
 class UniqueValidatorTest extends DatabaseTestCase
 {