diff --git a/src/views/spectrumAnalysis/components/RoiLimits/components/RoiLimitItem.vue b/src/views/spectrumAnalysis/components/RoiLimits/components/RoiLimitItem.vue
index 9ffabe1..b68a8bc 100644
--- a/src/views/spectrumAnalysis/components/RoiLimits/components/RoiLimitItem.vue
+++ b/src/views/spectrumAnalysis/components/RoiLimits/components/RoiLimitItem.vue
@@ -199,7 +199,7 @@ export default {
     handleTooltipFormat(params) {
       const [xAxis, count] = params[0].value
       const channel = Math.round(xAxis)
-      const channelData = this.channelData.all && this.channelData.all.pointlist[channel]
+      const channelData = this.channelData.all && this.channelData.all.pointlist[channel - 1]
       const energy = this.getEnergyByChannel(channel)
       this.axisInfo = {
         channel,