diff --git a/source/source_io/module_parameter/read_input_item_elec_stru.cpp b/source/source_io/module_parameter/read_input_item_elec_stru.cpp
index 39f37febc5..53d53b4731 100644
--- a/source/source_io/module_parameter/read_input_item_elec_stru.cpp
+++ b/source/source_io/module_parameter/read_input_item_elec_stru.cpp
@@ -297,7 +297,7 @@ Then the user has to correct the input file and restart the calculation.)";
         item.availability = "";
         item.read_value = [](const Input_Item& item, Parameter& para) {
             para.input.nupdown = doublevalue;
-            para.sys.two_fermi = true;
+            para.sys.two_fermi = (doublevalue != 0.0);
         };
         item.reset_value = [](const Input_Item&, Parameter& para) {
             if (para.input.nspin == 1)