diff --git a/EPD/EPD_4in2.c b/EPD/EPD_4in2.c
index 5f87e90..0ed857b 100644
--- a/EPD/EPD_4in2.c
+++ b/EPD/EPD_4in2.c
@@ -228,8 +228,7 @@ void EPD_4IN2_Clear(void)
     UWORD Width, Height;
     Width = (EPD_4IN2_WIDTH % 8 == 0)? (EPD_4IN2_WIDTH / 8 ): (EPD_4IN2_WIDTH / 8 + 1);
     Height = EPD_4IN2_HEIGHT;
-		EPD_4IN2_SendCommand(0x92);	
-		EPD_4IN2_SetLut();
+
     EPD_4IN2_SendCommand(0x10);
     for (UWORD j = 0; j < Height; j++) {
         for (UWORD i = 0; i < Width; i++) {
@@ -256,8 +255,14 @@ void EPD_4IN2_Display(UBYTE *Image)
     UWORD Width, Height;
     Width = (EPD_4IN2_WIDTH % 8 == 0)? (EPD_4IN2_WIDTH / 8 ): (EPD_4IN2_WIDTH / 8 + 1);
     Height = EPD_4IN2_HEIGHT;
-		EPD_4IN2_SendCommand(0x92);	
-		EPD_4IN2_SetLut();
+
+	EPD_4IN2_SendCommand(0x10);
+    for (UWORD j = 0; j < Height; j++) {
+        for (UWORD i = 0; i < Width; i++) {
+            EPD_4IN2_SendData(0x00);
+        }
+    }
+
     EPD_4IN2_SendCommand(0x13);
     for (UWORD j = 0; j < Height; j++) {
         for (UWORD i = 0; i < Width; i++) {
diff --git a/EPD/EPD_Test.c b/EPD/EPD_Test.c
new file mode 100644
index 0000000..95251f1
--- /dev/null
+++ b/EPD/EPD_Test.c
@@ -0,0 +1,160 @@
+#include "EPD_Test.h"
+#include "EPD_4in2.h"
+
+const unsigned char EPD_4IN2_4Gray_lut_vcom[] =
+{
+    0x00 ,0x0A ,0x00 ,0x00 ,0x00 ,0x01,
+    0x60 ,0x14 ,0x14 ,0x00 ,0x00 ,0x01,
+    0x00 ,0x14 ,0x00 ,0x00 ,0x00 ,0x01,
+    0x00 ,0x13 ,0x0A ,0x01 ,0x00 ,0x01,
+    0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00,
+    0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00,
+    0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00
+};
+
+const unsigned char EPD_4IN2_4Gray_lut_ww[] ={
+    0x40 ,0x0A ,0x00 ,0x00 ,0x00 ,0x01,
+    0x90 ,0x14 ,0x14 ,0x00 ,0x00 ,0x01,
+    0x10 ,0x14 ,0x0A ,0x00 ,0x00 ,0x01,
+    0xA0 ,0x13 ,0x01 ,0x00 ,0x00 ,0x01,
+    0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00,
+    0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00,
+    0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00,
+};
+
+const unsigned char EPD_4IN2_4Gray_lut_bw[] ={
+    0x40 ,0x0A ,0x00 ,0x00 ,0x00 ,0x01,
+    0x90 ,0x14 ,0x14 ,0x00 ,0x00 ,0x01,
+    0x00 ,0x14 ,0x0A ,0x00 ,0x00 ,0x01,
+    0x99 ,0x0C ,0x01 ,0x03 ,0x04 ,0x01,
+    0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00,
+    0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00,
+    0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00,
+};
+
+const unsigned char EPD_4IN2_4Gray_lut_wb[] ={
+    0x40 ,0x0A ,0x00 ,0x00 ,0x00 ,0x01,
+    0x90 ,0x14 ,0x14 ,0x00 ,0x00 ,0x01,
+    0x00 ,0x14 ,0x0A ,0x00 ,0x00 ,0x01,
+    0x99 ,0x0B ,0x04 ,0x04 ,0x01 ,0x01,
+    0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00,
+    0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00,
+    0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00,
+};
+
+const unsigned char EPD_4IN2_4Gray_lut_bb[] ={
+    0x80 ,0x0A ,0x00 ,0x00 ,0x00 ,0x01,
+    0x90 ,0x14 ,0x14 ,0x00 ,0x00 ,0x01,
+    0x20 ,0x14 ,0x0A ,0x00 ,0x00 ,0x01,
+    0x50 ,0x13 ,0x01 ,0x00 ,0x00 ,0x01,
+    0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00,
+    0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00,
+    0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00,
+};
+
+static void EPD_4IN2_4Gray_lut(void)
+{
+	unsigned int count;
+
+    EPD_4IN2_SendCommand(0x20);							//vcom
+    for(count=0;count<42;count++)
+        {EPD_4IN2_SendData(EPD_4IN2_4Gray_lut_vcom[count]);}
+    
+    EPD_4IN2_SendCommand(0x21);							//red not use
+    for(count=0;count<42;count++)
+        {EPD_4IN2_SendData(EPD_4IN2_4Gray_lut_ww[count]);}
+
+    EPD_4IN2_SendCommand(0x22);							//bw r
+    for(count=0;count<42;count++)
+        {EPD_4IN2_SendData(EPD_4IN2_4Gray_lut_bw[count]);}
+
+    EPD_4IN2_SendCommand(0x23);							//wb w
+    for(count=0;count<42;count++)
+        {EPD_4IN2_SendData(EPD_4IN2_4Gray_lut_wb[count]);}
+
+    EPD_4IN2_SendCommand(0x24);							//bb b
+    for(count=0;count<42;count++)
+        {EPD_4IN2_SendData(EPD_4IN2_4Gray_lut_bb[count]);}
+
+    EPD_4IN2_SendCommand(0x25);							//vcom
+    for(count=0;count<42;count++)
+        {EPD_4IN2_SendData(EPD_4IN2_4Gray_lut_ww[count]);}
+}
+
+static void drawNormal(void)
+{
+    UWORD Width, Height;
+    Width = (EPD_4IN2_WIDTH % 8 == 0)? (EPD_4IN2_WIDTH / 8 ): (EPD_4IN2_WIDTH / 8 + 1);
+    Height = EPD_4IN2_HEIGHT;
+
+    EPD_4IN2_SendCommand(0x10);
+    for (UWORD j = 0; j < Height; j++) {
+        for (UWORD i = 0; i < Width; i++) {
+            EPD_4IN2_SendData(0xFF);
+        }
+    }
+
+    EPD_4IN2_SendCommand(0x13);
+    for (UWORD j = 0; j < Height; j++) {
+        for (UWORD i = 0; i < Width; i++) {
+            EPD_4IN2_SendData(((j + 1)*2 > Height) ? 0x00 : 0xFF);
+        }
+    }
+
+    EPD_4IN2_TurnOnDisplay();
+}
+
+static void draw4Gray(void)
+{
+    UWORD Width, Height;
+    Width = (EPD_4IN2_WIDTH % 8 == 0)? (EPD_4IN2_WIDTH / 8 ): (EPD_4IN2_WIDTH / 8 + 1);
+    Height = EPD_4IN2_HEIGHT;
+
+    EPD_4IN2_SendCommand(0x10);
+    for (UWORD i = 0; i < Width * Height; i++) {
+        UWORD idx = (i % 50) / 12;
+        if (idx > 3) idx = 3;
+        if (idx == 0 || idx == 1) {
+            EPD_4IN2_SendData(0x00);
+        } else if (idx == 2 || idx == 3) {
+            EPD_4IN2_SendData(0xFF);
+        }
+    }
+
+    EPD_4IN2_SendCommand(0x13);
+    for (UWORD i = 0; i < Width * Height; i++) {
+        UWORD idx = (i % 50) / 12;
+        if (idx > 3) idx = 3;
+        if (idx == 0 || idx == 2) {
+            EPD_4IN2_SendData(0x00);
+        } else if (idx == 1 || idx == 3) {
+            EPD_4IN2_SendData(0xFF);
+        }
+    }
+
+    EPD_4IN2_4Gray_lut();
+    EPD_4IN2_TurnOnDisplay();
+}
+
+void EPD_4in2_test(void)
+{
+    DEV_Module_Init();
+
+    EPD_4IN2_Init();
+    EPD_4IN2_Clear();
+    DEV_Delay_ms(500);
+
+    drawNormal();
+    DEV_Delay_ms(3000);
+
+    EPD_4IN2_Clear();
+    DEV_Delay_ms(500);
+
+    draw4Gray();
+    DEV_Delay_ms(500);
+    
+    EPD_4IN2_Sleep();
+    DEV_Delay_ms(500);
+    DEV_Module_Exit();
+}
+
diff --git a/EPD/EPD_Test.h b/EPD/EPD_Test.h
new file mode 100644
index 0000000..dd37fdb
--- /dev/null
+++ b/EPD/EPD_Test.h
@@ -0,0 +1,3 @@
+#include "DEV_Config.h"
+
+void EPD_4in2_test(void);
diff --git a/Keil/EPD.uvprojx b/Keil/EPD.uvprojx
index 6ca5a42..012ba9b 100644
--- a/Keil/EPD.uvprojx
+++ b/Keil/EPD.uvprojx
@@ -408,6 +408,62 @@
         <Group>
           <GroupName>EPD</GroupName>
           <Files>
+            <File>
+              <FileName>EPD_Test.c</FileName>
+              <FileType>1</FileType>
+              <FilePath>..\EPD\EPD_Test.c</FilePath>
+              <FileOption>
+                <CommonProperty>
+                  <UseCPPCompiler>2</UseCPPCompiler>
+                  <RVCTCodeConst>0</RVCTCodeConst>
+                  <RVCTZI>0</RVCTZI>
+                  <RVCTOtherData>0</RVCTOtherData>
+                  <ModuleSelection>0</ModuleSelection>
+                  <IncludeInBuild>0</IncludeInBuild>
+                  <AlwaysBuild>2</AlwaysBuild>
+                  <GenerateAssemblyFile>2</GenerateAssemblyFile>
+                  <AssembleAssemblyFile>2</AssembleAssemblyFile>
+                  <PublicsOnly>2</PublicsOnly>
+                  <StopOnExitCode>11</StopOnExitCode>
+                  <CustomArgument></CustomArgument>
+                  <IncludeLibraryModules></IncludeLibraryModules>
+                  <ComprImg>1</ComprImg>
+                </CommonProperty>
+                <FileArmAds>
+                  <Cads>
+                    <interw>2</interw>
+                    <Optim>0</Optim>
+                    <oTime>2</oTime>
+                    <SplitLS>2</SplitLS>
+                    <OneElfS>2</OneElfS>
+                    <Strict>2</Strict>
+                    <EnumInt>2</EnumInt>
+                    <PlainCh>2</PlainCh>
+                    <Ropi>2</Ropi>
+                    <Rwpi>2</Rwpi>
+                    <wLevel>0</wLevel>
+                    <uThumb>2</uThumb>
+                    <uSurpInc>2</uSurpInc>
+                    <uC99>2</uC99>
+                    <uGnu>2</uGnu>
+                    <useXO>2</useXO>
+                    <v6Lang>0</v6Lang>
+                    <v6LangP>0</v6LangP>
+                    <vShortEn>2</vShortEn>
+                    <vShortWch>2</vShortWch>
+                    <v6Lto>2</v6Lto>
+                    <v6WtE>2</v6WtE>
+                    <v6Rtti>2</v6Rtti>
+                    <VariousControls>
+                      <MiscControls></MiscControls>
+                      <Define></Define>
+                      <Undefine></Undefine>
+                      <IncludePath></IncludePath>
+                    </VariousControls>
+                  </Cads>
+                </FileArmAds>
+              </FileOption>
+            </File>
             <File>
               <FileName>DEV_Config.c</FileName>
               <FileType>1</FileType>
@@ -955,6 +1011,11 @@
         <Group>
           <GroupName>EPD</GroupName>
           <Files>
+            <File>
+              <FileName>EPD_Test.c</FileName>
+              <FileType>1</FileType>
+              <FilePath>..\EPD\EPD_Test.c</FilePath>
+            </File>
             <File>
               <FileName>DEV_Config.c</FileName>
               <FileType>1</FileType>
@@ -1502,6 +1563,11 @@
         <Group>
           <GroupName>EPD</GroupName>
           <Files>
+            <File>
+              <FileName>EPD_Test.c</FileName>
+              <FileType>1</FileType>
+              <FilePath>..\EPD\EPD_Test.c</FilePath>
+            </File>
             <File>
               <FileName>DEV_Config.c</FileName>
               <FileType>1</FileType>
diff --git a/main.c b/main.c
index 22b0eba..56eabc9 100644
--- a/main.c
+++ b/main.c
@@ -27,6 +27,9 @@
 #include "app_error.h"
 #include "app_timer.h"
 #include "EPD_ble.h"
+#ifdef DEBUG
+#include "EPD_Test.h"
+#endif
 
 #define IS_SRVC_CHANGED_CHARACT_PRESENT  1                                              /**< Include or not the service_changed characteristic. if not enabled, the server's database cannot be changed for the lifetime of the device*/
 
@@ -386,6 +389,10 @@ int main(void)
 
     NRF_LOG_PRINTF("done.\n");
 
+#ifdef DEBUG
+    EPD_4in2_test();
+#endif
+
     for (;;)
     {
         power_manage();