diff --git a/rtl/inc/sm3_cfg.v b/rtl/inc/sm3_cfg.v
index 1bc10b4..dc3739d 100644
--- a/rtl/inc/sm3_cfg.v
+++ b/rtl/inc/sm3_cfg.v
@@ -70,4 +70,16 @@
 //显式例化 CSA 加法器 在 SM3_CMPRSS_DIRECT_ADD 未定义时有效
 `ifndef  SM3_CMPRSS_DIRECT_ADD
     `define SM3_CMPRSS_CSA_ADD
-`endif
\ No newline at end of file
+`endif
+
+//定义仿真器 define simulator
+// Modelsim_10_5(windows), default 
+// EpicSim (Linux)
+//`define EPICSIM
+`ifndef EPICSIM
+    `define MODELSIM_10_5
+`endif
+
+//定义是否使用 C 语言参考模型(DPI)
+//define using C reference model or not
+//`define C_MODEL_ENABLE
\ No newline at end of file
diff --git a/sim/script/epicsim_sm3_core_top_tb.sh b/sim/script/epicsim_sm3_core_top_tb.sh
new file mode 100644
index 0000000..f596603
--- /dev/null
+++ b/sim/script/epicsim_sm3_core_top_tb.sh
@@ -0,0 +1,5 @@
+#epicsim_sm3_core_top_tb.sh
+#@ljgibbs / lf_gibbs@163.com
+#usage: script for running tb_sm3_core_top.sv with EpicSim, a opensource simulator
+
+epicsim -g2005-sv ../tb/tb_sm3_core_top.sv -I ../../rtl/inc/ -L ../../rtl/
diff --git a/sim/tb/tb_sm3_core_top.sv b/sim/tb/tb_sm3_core_top.sv
index 4e8e886..d064b82 100644
--- a/sim/tb/tb_sm3_core_top.sv
+++ b/sim/tb/tb_sm3_core_top.sv
@@ -14,6 +14,7 @@
 // Revision 0.01 - File Created
 // Revision 0.02 - Pass random test with c model
 // Revision 0.03 - Pass random test with c model (64bit)
+// Revision 0.03 - Add more macro control
 //////////////////////////////////////////////////////////////////////////////////
 module tb_sm3_core_top (                 
 );
@@ -26,8 +27,10 @@ module tb_sm3_core_top (
     bit [63:0]                  urand_num;
 `endif
 
+`ifdef C_MODEL_ENABLE
 //import c reference function
 import "DPI-C" function void sm3_c(input int len,input bit[7:0] data[],output bit[31:0] res[]);
+`endif
 
 int i;
 bit [7:0] data[1050];//TODO buff length limit the inpt data length 
@@ -70,7 +73,11 @@ initial begin
         `endif
 
         @(posedge sm3if.clk);
-        task_rndm_inpt_cmpr_cmodel(sm3_inpt_byte_num);
+        `ifdef C_MODEL_ENABLE
+            task_rndm_inpt_cmpr_cmodel(sm3_inpt_byte_num);
+        `else
+            task_pad_inpt_gntr_exmpl0_32(); 
+        `endif
         @(posedge sm3if.clk);
     end
     
@@ -79,6 +86,7 @@ end
 
 always #5 sm3if.clk = ~sm3if.clk; 
 
+`ifdef C_MODEL_ENABLE
 //产生填充模块输入，随机输入，并与 c 语言参考模型比较
 task automatic task_rndm_inpt_cmpr_cmodel(
     input bit [60:0] byte_num
@@ -189,7 +197,7 @@ task automatic task_rndm_inpt_cmpr_cmodel(
     foreach(res[i])
         $display("C model output %d:%x", i,res[i]);
 endtask //automatic
-
+`endif
 
 //产生填充模块输入，采用示例输入 'abc' 32bit 输入
 task automatic task_pad_inpt_gntr_exmpl0_32();