diff --git a/sf_base/models/common.py b/sf_base/models/common.py
index a6aaf0f8..4425960c 100644
--- a/sf_base/models/common.py
+++ b/sf_base/models/common.py
@@ -67,7 +67,7 @@ class MrsMaterialModel(models.Model):
     mf_materia_post = fields.Char("热处理后密度")
     density = fields.Float("密度(kg/m³)")
     materials_id = fields.Many2one('sf.production.materials', "材料名")
-    tensile_strength = fields.Float("拉伸强度(n/mm²)")
+    tensile_strength = fields.Char("拉伸强度(n/mm²)")
     hardness = fields.Float("硬度(hrc)")
     rough_machining = fields.Float("粗加工Vc(m/min)")
     finish_machining = fields.Float("精加工Vc(m/min)")