diff --git a/module/testcase/control.php b/module/testcase/control.php
index 462ff399c5..49c3459b61 100644
--- a/module/testcase/control.php
+++ b/module/testcase/control.php
@@ -1289,13 +1289,15 @@ class testcase extends control
         $this->app->loadClass('pager', $static = true);
         $pager = pager::init(0, $recPerPage, $pageID);
 
+        $cases = $this->testcase->getCanImportCases($productID, $libID, $orderBy, $pager, $browseType, (int)$queryID);
+
         /* 展示变量. */
         /* Show the variables. */
-        $this->testcaseZen->assignForImportFromLib($productID, $branch, $libID, $orderBy, $queryID, $libraries, $projectID);
+        $this->testcaseZen->assignForImportFromLib($productID, $branch, $libID, $orderBy, $queryID, $libraries, $projectID, $cases);
 
         $this->view->title      = $this->lang->testcase->common . $this->lang->hyphen . $this->lang->testcase->importFromLib;
         $this->view->libraries  = $libraries;
-        $this->view->cases      = $this->testcase->getCanImportCases($productID, $libID, $branch, $orderBy, $pager, $browseType, (int)$queryID);
+        $this->view->cases      = $cases;
         $this->view->libModules = $this->tree->getOptionMenu($libID, 'caselib');
         $this->view->pager      = $pager;
         $this->view->browseType = $browseType;
@@ -1994,7 +1996,7 @@ class testcase extends control
      */
     public function ajaxGetCanImportModuleItems(int $productID, int $libID, int $branch, int $caseID)
     {
-        $moduleItems     = $this->testcase->getCanImportedModules($productID, $libID, $branch, 'items');
+        $moduleItems     = $this->testcase->getCanImportedModules($productID, $libID, $branch, 'items', array($caseID => $caseID));
         $caseModuleItmes = isset($moduleItems[$caseID]) ? $moduleItems[$caseID] : array();
         return print(json_encode($caseModuleItmes));
     }
diff --git a/module/testcase/model.php b/module/testcase/model.php
index 2b6a8ee3c7..48443a3557 100755
--- a/module/testcase/model.php
+++ b/module/testcase/model.php
@@ -2705,14 +2705,13 @@ class testcaseModel extends model
      *
      * @param  int    $productID
      * @param  int    $libID
-     * @param  int    $branch
      * @param  string $orderBy
      * @param  object $pager
      * @param  int    $queryID
      * @access public
      * @return array
      */
-    public function getCanImportCases(int $productID, int $libID, int|string $branch, string $orderBy = 'id_desc', object $pager = null, string $browseType = '', int $queryID = 0): array
+    public function getCanImportCases(int $productID, int $libID, string $orderBy = 'id_desc', object $pager = null, string $browseType = '', int $queryID = 0): array
     {
         $query = '';
         if($browseType == 'bysearch')
@@ -2739,16 +2738,32 @@ class testcaseModel extends model
         }
 
         $this->loadModel('branch');
-        $product   = $this->loadModel('product')->getById($productID);
-        $branches  = $branch === 'all' && $product->type != 'normal' ? array(BRANCH_MAIN => $this->lang->branch->main) + $this->branch->getPairs($productID, 'active') : array($product->type == 'normal' ? 0 : $branch => '');
-        $canImport = array();
-        foreach($branches as $branchID => $branchName) $canImport += $this->getCanImportedModules($productID, $libID, $branchID);
+        $this->loadModel('tree');
+        $product       = $this->loadModel('product')->getById($productID);
+        $branches      = $product->type != 'normal' ? array(BRANCH_MAIN => $this->lang->branch->main) + $this->branch->getPairs($productID, 'active') : array(0);
+        $branches      = array_keys($branches);
+        $branchModules = array();
+        foreach($branches as $branch) $branchModules[$branch] = $this->tree->getOptionMenu($productID, 'case', 0, (string)$branch);
+
+        $caseModuleCount = $this->dao->select('fromCaseID,count(module) AS moduleCount')
+            ->from(TABLE_CASE)->alias('t1')
+            ->leftJoin(TABLE_MODULE)->alias('t2')->on('t1.module=t2.id and t1.product = t2.root')
+            ->where('t1.product')->eq($productID)
+            ->andWhere('t1.lib')->eq($libID)
+            ->andWhere('t1.fromCaseID')->ne('')
+            ->andWhere('t1.deleted')->eq('0')
+            ->andWhere('((t2.type')->in('story,case')->andWhere('t2.deleted')->eq('0')->markRight(1)
+            ->orWhere('t1.module')->eq('0')->markRight(1)
+            ->groupBy('t1.fromCaseID')
+            ->fetchPairs();
+        $canImport = $canNotImport = array();
 
         return $this->dao->select('*')->from(TABLE_CASE)
             ->where('deleted')->eq('0')
             ->beginIF($browseType != 'bysearch')->andWhere('lib')->eq($libID)->fi()
             ->beginIF($browseType == 'bysearch')->andWhere($query)->fi()
-            ->andWhere('id')->in(array_keys($canImport))
+            ->beginIF(count($canImport) <= count($canNotImport))->andWhere('id')->in($canImport)->fi()
+            ->beginIF(count($canImport) > count($canNotImport))->andWhere('id')->notIn($canNotImport)->fi()
             ->andWhere('product')->eq(0)
             ->orderBy($orderBy)
             ->page($pager)
@@ -2766,7 +2781,7 @@ class testcaseModel extends model
      * @access public
      * @return array
      */
-    public function getCanImportedModules(int $productID, int $libID, int|string $branch, string $returnType = 'pairs'): array
+    public function getCanImportedModules(int $productID, int $libID, int|string $branch, string $returnType = 'pairs', array $libCases = array()): array
     {
         $importedModules = $this->dao->select('fromCaseID,module')->from(TABLE_CASE)
             ->where('product')->eq($productID)
@@ -2777,8 +2792,8 @@ class testcaseModel extends model
             ->fetchGroup('fromCaseID', 'module');
         foreach($importedModules as $fromCaseID => $modules) $importedModules[$fromCaseID] = array_combine(array_keys($modules), array_keys($modules));
 
-        $libCases = $this->loadModel('caselib')->getLibCases($libID, 'all');
-        $modules  = $this->loadModel('tree')->getOptionMenu($productID, 'case', 0, (string)$branch);
+        if(empty($libCases)) $libCases = $this->loadModel('caselib')->getLibCases($libID, 'all');
+        $modules = $this->loadModel('tree')->getOptionMenu($productID, 'case', 0, (string)$branch);
         if($returnType == 'items')
         {
             $moduleItems = array();
@@ -2786,7 +2801,8 @@ class testcaseModel extends model
         }
 
         $canImportModules = array();
-        foreach($libCases as $caseID => $case){
+        foreach($libCases as $caseID => $case)
+        {
             $caseModules = !empty($importedModules[$caseID]) ? $importedModules[$caseID] : array();
             $canImportModules[$caseID] = $returnType == 'pairs' ? array_diff_key($modules, $caseModules) : array_diff_key($moduleItems, $caseModules);
             if(!empty($canImportModules[$caseID]))
diff --git a/module/testcase/zen.php b/module/testcase/zen.php
index 8085c60249..2ed090c546 100755
--- a/module/testcase/zen.php
+++ b/module/testcase/zen.php
@@ -191,10 +191,11 @@ class testcaseZen extends testcase
      * @param  string    $orderBy
      * @param  int       $queryID
      * @param  array     $libraries
+     * @param  array     $cases
      * @access protected
      * @return void
      */
-    protected function assignForImportFromLib(int $productID, string $branch, int $libID, string $orderBy, int $queryID, array $libraries, int $projectID): void
+    protected function assignForImportFromLib(int $productID, string $branch, int $libID, string $orderBy, int $queryID, array $libraries, int $projectID, array $cases): void
     {
         $product    = $this->loadModel('product')->getById($productID);
         $branches   = array();
@@ -204,8 +205,8 @@ class testcaseZen extends testcase
             $branches = array(BRANCH_MAIN => $this->lang->branch->main) + $this->branch->getPairs($productID, 'active', $projectID);
         }
 
-        foreach($branches as $branchID => $branchName) $canImportModules[$branchID] = $this->testcase->getCanImportedModules($productID, $libID, $branchID, 'items');
-        if(empty($branches)) $canImportModules[0] = $this->testcase->getCanImportedModules($productID, $libID, 0, 'items');
+        foreach($branches as $branchID => $branchName) $canImportModules[$branchID] = $this->testcase->getCanImportedModules($productID, $libID, $branchID, 'items', $cases);
+        if(empty($branches)) $canImportModules[0] = $this->testcase->getCanImportedModules($productID, $libID, 0, 'items', $cases);
 
         /* Build the search form. */
         $actionURL = $this->createLink('testcase', 'importFromLib', "productID={$productID}&branch={$branch}&libID={$libID}&orderBy={$orderBy}&browseType=bySearch&queryID=myQueryID");
@@ -1703,12 +1704,12 @@ class testcaseZen extends testcase
             {
                 if($branch != 'ditto') $prevBranch = $branch;
                 if($branch == 'ditto') $branches[$caseID] = $prevBranch;
-                if(!isset($caseModules[$branch]) && in_array($caseID, $caseIdList) !== false) $caseModules[$branch] = $this->testcase->getCanImportedModules($productID, $libID, $branch);
+                if(!isset($caseModules[$branch]) && in_array($caseID, $caseIdList) !== false) $caseModules[$branch] = $this->testcase->getCanImportedModules($productID, $libID, $branch, 'pairs', $caseIdList);
             }
         }
         else
         {
-            $caseModules[$branch] = $this->testcase->getCanImportedModules($productID, $libID, $branch);
+            $caseModules[$branch] = $this->testcase->getCanImportedModules($productID, $libID, $branch, 'pairs', $caseIdList);
         }
 
         /* 构建用例。 */