diff --git a/data/dFormula.php b/data/dFormula.php
index 6f5353c..a4fc475 100644
--- a/data/dFormula.php
+++ b/data/dFormula.php
@@ -17,6 +17,7 @@ class dFormula extends dBase {
             'original',
             'method',
             'sort',
+            'create_time',
         ),
         'tcm_formula_herb' => array(
             'id',