diff --git a/usrc/subboards/subboard20_plate_clamp_case/plate_code_scaner_module.cpp b/usrc/subboards/subboard20_plate_clamp_case/plate_code_scaner_module.cpp
index e76cfd0..f81c4f4 100644
--- a/usrc/subboards/subboard20_plate_clamp_case/plate_code_scaner_module.cpp
+++ b/usrc/subboards/subboard20_plate_clamp_case/plate_code_scaner_module.cpp
@@ -108,7 +108,7 @@ void PlateCodeScanerModule::initialize(int32_t moduleid, hardware_config_t* hard
 
   m_reg.laster_intensity        = 99;
   m_reg.scan_gain               = 1;
-  m_reg.scan_velocity           = 500;
+  m_reg.scan_velocity           = 50;
   m_reg.scan_start_pos          = 960;
   m_reg.code_judgment_threshold = 1000;
   m_reg.item                    = 0;