diff --git a/mainwindow.cpp b/mainwindow.cpp
index 196e951..d054b99 100644
--- a/mainwindow.cpp
+++ b/mainwindow.cpp
@@ -708,12 +708,12 @@ bool MainWindow::updatePhaseIndicatorLight(){
     return sysPara->status.lastPhaseFault;
 }
 
-double MainWindow::getMaxSpeedCalcPara(){
+int MainWindow::getMaxSpeedCalcPara(){
     sysPara->para.printRowDelay = sysPara->para.currPrintMode;
     if(sysPara->status.isPrinting == false)
         sysPara->status.pixNumPerCol = sysPara->status.currPrintRow;
-    // else
-    //     sysPara->status.currPrintRow = sysPara->status.pixNumPerCol;
+    else
+        sysPara->status.currPrintRow = sysPara->status.pixNumPerCol;
     sysPara->para.pixNumPerCol = sysPara->status.pixNumPerCol;
 
     sysPara->para.reducedPixelNum = sysPara->para.reducedPixelNumRatio*sysPara->para.pixNumPerCol/100;
@@ -726,15 +726,9 @@ double MainWindow::getMaxSpeedCalcPara(){
 
     int dotNum = sysPara->para.divideRatio?(FPGA_SYS_HZ/(sysPara->para.divideRatio*2)):0;// 1s时间内墨点数 （即晶振频率 64000)
     int colNum = dotNumPerCol?dotNum/dotNumPerCol:0;  // 第列可用墨点数 ＝ 1s时间内墨点数/ 列需要墨点数
-    double pulseNum = colNum*sysPara->para.synNumPerCol/(1<<8);	//synNumPerCol是被放大后的值
+    int pulseNum = colNum*sysPara->para.synNumPerCol/(1<<8);	//synNumPerCol是被放大后的值
 
-    if(sysPara->para.divideRatio == 0 || sysPara->para.synPulseNumPerMm == 0)
-        return 600.0f;
-
-    double freq = (FPGA_SYS_HZ/(sysPara->para.divideRatio*2));
-    double ddotNumPerCol = sysPara->status.currPrintRow - (sysPara->status.currPrintRow * sysPara->para.reducedPixelNumRatio / 100.0);
-    pulseNum = sysPara->para.printColDelay / sysPara->para.synPulseNumPerMm / 1000.0 * freq / ddotNumPerCol * 60.0;
-    return qBound(0.0, pulseNum, 600.0);
+    return pulseNum;
 }
 
 static int reclaimTankDelay = 0;
@@ -800,8 +794,8 @@ void MainWindow::updateSysStatusToUI(){ //100ms
                 }
                 else
                 {
-                    double speed = getMaxSpeedCalcPara();//No67
-                    maxMM = int(speed * 1000.0);
+                    int pulsePS = getMaxSpeedCalcPara();//No67
+                    maxMM = (pulsePS/sysPara->para.synPulseNumPerMm) * 60;// 列的最大间距
                 }
                 ui->labelSynRate->setText(tr("%1.%2[%3.%4]米/分").arg(mm/1000).arg(mm%1000,3,10,QLatin1Char('0'))
                                           .arg(maxMM/1000).arg(maxMM%1000,3,10,QLatin1Char('0')));
diff --git a/mainwindow.h b/mainwindow.h
index 0ed259b..7397adc 100644
--- a/mainwindow.h
+++ b/mainwindow.h
@@ -63,7 +63,7 @@ public:
     void enableReclaimCtrlButton(bool enable);
     void resetReclaimCtrlButtonText();
     void enablePushButtonStart(bool enable);
-    double getMaxSpeedCalcPara();
+    int getMaxSpeedCalcPara();
 
     void PreviewPressed();
     int getCurrPrintStatus();