diff --git a/src/plugins/plot/MctPlot.vue b/src/plugins/plot/MctPlot.vue
index 0c49a8239a..1a23143925 100644
--- a/src/plugins/plot/MctPlot.vue
+++ b/src/plugins/plot/MctPlot.vue
@@ -457,7 +457,7 @@ export default {
         },
 
         setDisplayRange(series, xKey) {
-            if (this.config.series.length !== 1) {
+            if (this.config.series.model.length !== 1) {
                 return;
             }