diff --git a/src/Adapters/DatabaseAdapter.php b/src/Adapters/DatabaseAdapter.php
index 2709253..4aa601c 100755
--- a/src/Adapters/DatabaseAdapter.php
+++ b/src/Adapters/DatabaseAdapter.php
@@ -7,19 +7,27 @@
 use Lauthz\Models\Rule;
 use Lauthz\Contracts\DatabaseAdapter as DatabaseAdapterContract;
 use Lauthz\Contracts\BatchDatabaseAdapter as BatchDatabaseAdapterContract;
-use Lauthz\Contracts\UpdatableDatabaseAdapter as UpdatableDatabaseAdapterContract; 
+use Lauthz\Contracts\UpdatableDatabaseAdapter as UpdatableDatabaseAdapterContract;
+use Lauthz\Contracts\FilteredDatabaseAdapter as FilteredDatabaseAdapterContract;
+use Casbin\Persist\Adapters\Filter;
 use Casbin\Model\Model;
 use Casbin\Persist\AdapterHelper;
 use DateTime;
+use Casbin\Exceptions\InvalidFilterTypeException;
 /**
  * DatabaseAdapter.
  *
  * @author techlee@qq.com
  */
-class DatabaseAdapter implements DatabaseAdapterContract, BatchDatabaseAdapterContract, UpdatableDatabaseAdapterContract
+class DatabaseAdapter implements DatabaseAdapterContract, BatchDatabaseAdapterContract, UpdatableDatabaseAdapterContract, FilteredDatabaseAdapterContract
 {
     use AdapterHelper;
 
+    /**
+     * @var bool
+     */
+    private $filtered = false;
+
     /**
      * Rules eloquent model.
      *
@@ -232,4 +240,59 @@ public function updatePolicy(string $sec, string $ptype, array $oldRule, array $
         }
         $instance->update($update);
     }
+
+    /**
+     * Loads only policy rules that match the filter.
+     *
+     * @param Model $model
+     * @param mixed $filter
+     */
+    public function loadFilteredPolicy(Model $model, $filter): void
+    {
+        $instance = $this->eloquent;
+
+        if (is_string($filter)) {
+            $filter = str_replace(' ', '', $filter);
+            $filter = explode('=', $filter);
+            $instance = $instance->where($filter[0], $filter[1]);
+        } else if ($filter instanceof Filter) {
+            foreach($filter->p as $k => $v) {
+                $where[$v] = $filter->g[$k];
+                $instance = $instance->where($v, $filter->g[$k]);
+            }
+        } else if ($filter instanceof \Closure) {
+            $filter($instance);
+        } else {
+            throw new InvalidFilterTypeException('invalid filter type');
+        }
+        $rows = $instance->get()->makeHidden(['created_at','updated_at', 'id'])->toArray();
+        foreach ($rows as $row) {
+            $row = array_filter($row, function($value) { return !is_null($value) && $value !== ''; });
+            $line = implode(', ', array_filter($row, function ($val) {
+                return '' != $val && !is_null($val);
+            }));
+            $this->loadPolicyLine(trim($line), $model);
+        }
+        $this->setFiltered(true);
+    }
+
+    /**
+     * Returns true if the loaded policy has been filtered.
+     *
+     * @return bool
+     */
+    public function isFiltered(): bool
+    {
+        return $this->filtered;
+    }
+
+    /**
+     * Sets filtered parameter.
+     *
+     * @param bool $filtered
+     */
+    public function setFiltered(bool $filtered): void
+    {
+        $this->filtered = $filtered;
+    }
 }
diff --git a/src/Contracts/FilteredDatabaseAdapter.php b/src/Contracts/FilteredDatabaseAdapter.php
new file mode 100644
index 0000000..4a30d53
--- /dev/null
+++ b/src/Contracts/FilteredDatabaseAdapter.php
@@ -0,0 +1,9 @@
+<?php
+
+namespace Lauthz\Contracts;
+
+use Casbin\Persist\FilteredAdapter;
+
+interface FilteredDatabaseAdapter extends FilteredAdapter
+{
+}
diff --git a/tests/DatabaseAdapterTest.php b/tests/DatabaseAdapterTest.php
index b147dfa..64d138a 100644
--- a/tests/DatabaseAdapterTest.php
+++ b/tests/DatabaseAdapterTest.php
@@ -4,7 +4,9 @@
 
 use Enforcer;
 use Illuminate\Foundation\Testing\DatabaseMigrations;
-
+use Casbin\Persist\Adapters\Filter;
+use Lauthz\Models\Rule;
+use Casbin\Exceptions\InvalidFilterTypeException;
 class DatabaseAdapterTest extends TestCase
 {
     use DatabaseMigrations;
@@ -128,4 +130,48 @@ public function testUpdatePolicy()
             ['data2_admin', 'data2', 'write'],
         ], Enforcer::getPolicy());
     }
+
+    public function testLoadFilteredPolicy()
+    {
+        $this->initTable();
+        Enforcer::clearPolicy();
+        $this->initConfig();
+        $adapter = Enforcer::getAdapter();
+        $adapter->setFiltered(true);
+        $this->assertEquals([], Enforcer::getPolicy());
+
+        // invalid filter type
+        try {
+            $filter = ['alice', 'data1', 'read'];
+            Enforcer::loadFilteredPolicy($filter);
+            $e = InvalidFilterTypeException::class;
+            $this->fail("Expected exception $e not thrown");
+        } catch (InvalidFilterTypeException $e) {
+            $this->assertEquals("invalid filter type", $e->getMessage());
+        }
+
+        // string
+        $filter = "v0 = bob";
+        Enforcer::loadFilteredPolicy($filter);
+        $this->assertEquals([
+            ['bob', 'data2', 'write']
+        ], Enforcer::getPolicy());
+        
+        // Filter
+        $filter = new Filter(['v2'], ['read']);
+        Enforcer::loadFilteredPolicy($filter);
+        $this->assertEquals([
+            ['alice', 'data1', 'read'],
+            ['data2_admin', 'data2', 'read'],
+        ], Enforcer::getPolicy());
+
+        // Closure
+        Enforcer::loadFilteredPolicy(function (Rule &$rule) {
+            $rule = $rule->where('v1', 'data1');
+        });
+
+        $this->assertEquals([
+            ['alice', 'data1', 'read'],
+        ], Enforcer::getPolicy());
+    }
 }