diff --git a/src/utils/tools.js b/src/utils/tools.js
index 21f12bd7..0fd8930a 100644
--- a/src/utils/tools.js
+++ b/src/utils/tools.js
@@ -668,20 +668,37 @@ export function handleEchartFontSize (option) {
   const newSeries = []
   const chartType = chartOption.series[0].type
   chartOption.series.forEach((series) => {
-    const seriesNew = {
-      ...series,
-      label: {
-        ...series.label,
-        fontSize: echartLabelFontSize
-      },
-      markLine: {
-        ...series.markLine,
+    if (series.markLine) {
+      const seriesNew = {
+        ...series,
         label: {
+          ...series.label,
           fontSize: echartLabelFontSize
+        },
+        markLine: {
+          ...series.markLine,
+          label: {
+            ...series.markLine.label,
+            fontSize: echartLabelFontSize
+          }
         }
       }
+      newSeries.push(seriesNew)
+    } else {
+      const seriesNew = {
+        ...series,
+        label: {
+          ...series.label,
+          fontSize: echartLabelFontSize
+        },
+        markLine: {
+          label: {
+            fontSize: echartLabelFontSize
+          }
+        }
+      }
+      newSeries.push(seriesNew)
     }
-    newSeries.push(seriesNew)
   })
 
   if (chartType === 'pie') {
diff --git a/src/views/charts/charts/chart-echart-mixin.js b/src/views/charts/charts/chart-echart-mixin.js
index 46f5bb51..fe06f5f5 100644
--- a/src/views/charts/charts/chart-echart-mixin.js
+++ b/src/views/charts/charts/chart-echart-mixin.js
@@ -114,20 +114,38 @@ export default {
                 const newSeries = []
                 const chartType = chartOption.series[0].type
                 chartOption.series.forEach((series) => {
-                  const seriesNew = {
-                    ...series,
-                    label: {
-                      ...series.label,
-                      fontSize: echartLabelFontSize
-                    },
-                    markLine: {
-                      ...series.markLine,
+                  if (series.markLine) {
+                    const seriesNew = {
+                      ...series,
                       label: {
+                        ...series.label,
                         fontSize: echartLabelFontSize
+                      },
+                      markLine: {
+                        ...series.markLine,
+                        label: {
+                          ...series.markLine.label,
+                          fontSize: echartLabelFontSize
+                        }
                       }
                     }
+                    newSeries.push(seriesNew)
+                  } else {
+                    const seriesNew = {
+                      ...series,
+                      label: {
+                        ...series.label,
+                        fontSize: echartLabelFontSize
+                      },
+                      markLine: {
+                        ...series.markLine,
+                        label: {
+                          fontSize: echartLabelFontSize
+                        }
+                      }
+                    }
+                    newSeries.push(seriesNew)
                   }
-                  newSeries.push(seriesNew)
                 })
 
                 if (chartType === 'pie') {