diff --git a/tracy/tracy/inc/read_script.h b/tracy/tracy/inc/read_script.h
index d1991ed3bbd42751320142e6336000b682f82fed..d2f8a4ac6337896577cd1a96e665d18f14b80227 100644
--- a/tracy/tracy/inc/read_script.h
+++ b/tracy/tracy/inc/read_script.h
@@ -1,6 +1,5 @@
 /* global flag, used in script_read() and main() for read the input from script*/
 
-extern bool CavityOnFlag;
 extern bool QuadFringeOnFlag;
 
 extern bool RFvoltageFlag; extern double RFvolt;
diff --git a/tracy/tracy/src/read_script.cc b/tracy/tracy/src/read_script.cc
index 3b18723d771b515583caa3da612f6e09ffaef706..5eaea51cd428ac9c46bb87ac8b9e7bc9e32fb837 100644
--- a/tracy/tracy/src/read_script.cc
+++ b/tracy/tracy/src/read_script.cc
@@ -28,7 +28,6 @@
 ****************************************************************************/
 /* global flag, used in script_read() and main() for read the input from script*/
 
-bool CavityOnFlag = false;
 bool QuadFringeOnFlag = false;
 
 bool RFvoltageFlag =false; double RFvolt =0.0;
@@ -346,13 +345,7 @@ void read_script(const char *param_file_name, bool rd_lat)
           EtaFlag = true;
         
       }
-       // include RF cavity and set 4/6 D tracking
-       // true=6D, false=4D
-      else if (strcmp("CavityOnFlag", name) == 0){
-       
-          globval.Cavity_on = true;
-        
-      } else if (strcmp("PhaseSpaceFlag", name) == 0) {
+       else if (strcmp("PhaseSpaceFlag", name) == 0) {
         sscanf(line, "%*s %s %lf %lf %lf %lf %lf %lf %ld %s", _Phase_Dim,
             &_Phase_X, &_Phase_Px, &_Phase_Y, &_Phase_Py, &_Phase_delta,
             &_Phase_ctau, &_Phase_nturn, str);