diff --git a/plotwidget.cpp b/plotwidget.cpp
index b6178c1..e1eb44a 100644
--- a/plotwidget.cpp
+++ b/plotwidget.cpp
@@ -391,7 +391,7 @@ void PlotWidget::drawLegend(QPainter &painter)
         }
 
         // 通道名
-        QString label = QString("ch%1").arg(ch);
+        QString label = QString("CH%1").arg(ch+1);
         painter.setPen(m_channelVisible[ch] ? m_textColor : QColor("#555555"));
         painter.drawText(QRect(legendX + 16, y, 50, itemHeight),
                          Qt::AlignLeft | Qt::AlignVCenter, label);