diff --git a/HuaGoCorrect/commondef.h b/HuaGoCorrect/commondef.h
index f3ef036..fc65d6e 100644
--- a/HuaGoCorrect/commondef.h
+++ b/HuaGoCorrect/commondef.h
@@ -329,6 +329,18 @@ enum Scanner_Reg_Defs
 	SR_CLR_ROLLER_NUM,
 	SR_GET_ROLLER_NUM,
 	SR_CLR_SCANN_NUM,
+	SR_GET_H_200_RATIO,
+	SR_SET_H_200_RATIO,
+	SR_GET_V_200_RATIO,
+	SR_SET_V_200_RATIO,
+	SR_GET_H_300_RATIO,
+	SR_SET_H_300_RATIO,
+	SR_GET_V_300_RATIO,
+	SR_SET_V_300_RATIO,
+	SR_GET_H_600_RATIO,
+	SR_SET_H_600_RATIO,
+	SR_GET_V_600_RATIO,
+	SR_SET_V_600_RATIO,
 	SR_UPDATA_START = 0x100,
 	SR_UPDATA_STAUTUS = 0x101,
 	SR_UPDATA_MD5_RELUST = 0x102,
diff --git a/HuaGoCorrect/gscan3399.cpp b/HuaGoCorrect/gscan3399.cpp
index 10098c6..2f2d7ce 100644
--- a/HuaGoCorrect/gscan3399.cpp
+++ b/HuaGoCorrect/gscan3399.cpp
@@ -200,11 +200,23 @@ std::string gscan3399::GetKernelVersion()
 void gscan3399::SetRatio(int tyepe, int ration,int dpi)
 {
 	scanner_write_reg(m_usb, tyepe == 0 ? SR_SET_H_RATIO : SR_SET_V_RATIO, ration);
-
+	if (dpi == 1)
+		scanner_write_reg(m_usb, tyepe == 0 ? SR_SET_H_200_RATIO : SR_SET_V_200_RATIO, ration);
+	else if(dpi == 2)
+		scanner_write_reg(m_usb, tyepe == 0 ? SR_SET_H_300_RATIO : SR_SET_V_300_RATIO, ration);
+	else
+		scanner_write_reg(m_usb, tyepe == 0 ? SR_SET_H_600_RATIO : SR_SET_V_600_RATIO, ration);
 }
 void gscan3399::GetRatio(int type, int& ratio,int dpi)
 {
-	ratio = scanner_read_reg(m_usb, type == 0 ? SR_GET_H_RATIO : SR_GET_V_RATIO);
+	if (dpi == 1)
+		ratio = scanner_read_reg(m_usb, type == 0 ? SR_GET_H_200_RATIO : SR_GET_V_200_RATIO);
+	else if (dpi == 2)
+		ratio = scanner_read_reg(m_usb, type == 0 ? SR_GET_H_300_RATIO : SR_GET_V_300_RATIO);
+	else
+		ratio = scanner_read_reg(m_usb, type == 0 ? SR_GET_H_600_RATIO : SR_GET_V_600_RATIO);
+	if(*((float*)&ratio) >1.2 || *((float*)&ratio) < 0.8)
+		ratio = scanner_read_reg(m_usb, type == 0 ? SR_GET_H_RATIO : SR_GET_V_RATIO);
 }
 
 void gscan3399::Reboot(bool loader)