diff --git a/Detector/DetCRD/compact/CRD_o1_v04/CRD_Dimensions_v01_04.xml b/Detector/DetCRD/compact/CRD_o1_v04/CRD_Dimensions_v01_04.xml
index dbc0a6d398397c517845c200377caeb9d2b16863..f06d550dd4c9be2b637b264f5ebaf5741e08fe97 100644
--- a/Detector/DetCRD/compact/CRD_o1_v04/CRD_Dimensions_v01_04.xml
+++ b/Detector/DetCRD/compact/CRD_o1_v04/CRD_Dimensions_v01_04.xml
@@ -5,7 +5,7 @@
 
   <info name="CRDDimensions"
        title="master file with includes and world dimension"
-       author="C.D.Fu"
+       author="C.D.Fu, Mengyao Liu"
        url="no"
        status="development"
        version="1.0">
@@ -91,8 +91,8 @@
     <constant name="DC_Endcap_dz" value="0.1*mm"/>
     <constant name="DC_half_length"  value="2980*mm" />
     <constant name="DC_safe_distance" value="0.02*mm"/>
-    <constant name="SDT_inner_wall_thickness" value="0.315*mm"/>
-    <constant name="SDT_outer_wall_thickness" value="3.86*mm"/>
+    <constant name="SDT_inner_wall_thickness" value="0.2*mm"/>
+    <constant name="SDT_outer_wall_thickness" value="2.8*mm"/>
     <constant name="MainTracker_half_length"  value="DC_half_length+DC_Endcap_dz" />
 
     <!--obselete for single drift chamber-->