diff --git a/app/HGProductionTool/form_maininterface.cpp b/app/HGProductionTool/form_maininterface.cpp
index e8524f3..f3c72e0 100644
--- a/app/HGProductionTool/form_maininterface.cpp
+++ b/app/HGProductionTool/form_maininterface.cpp
@@ -610,21 +610,29 @@ QString Form_mainInterface::getSpeedMode()
     const wchar_t G100[6] = { 70,80,90,110 };
     const wchar_t G200[6] = { 100,110,120,130 };
     const wchar_t G300[6] = { 40,50,60,70,80,90 };
+    const wchar_t G306[6] = { 30,40,50,60,70 };
     const wchar_t G400[6] = { 40,50,60,70,80,90 };
 
     int speed = 0;
+    QString devType = m_devType;
+    if (m_devFwNum.mid(3, 1) == "Z"); //306
+    {
+        devType = "G306";
+    }
 
-    if ((int)speedMode >= 40)
+    if ((int)speedMode >= 30)
         speed = (int)speedMode;
     else
     {
-        if (m_devType == "G100")
+        if (devType == "G100")
             speed = G100[(int)speedMode - 1];
-        else if (m_devType == "G200")
+        else if (devType == "G200")
             speed = G200[(int)speedMode - 1];
-        else if (m_devType == "G300")
+        else if (devType == "G300")
             speed = G300[(int)speedMode - 1];
-        else if (m_devType == "G400")
+        else if (devType == "G306")
+            speed = G306[(int)speedMode - 1];
+        else if (devType == "G400")
             speed = G400[(int)speedMode - 1];
     }