diff --git a/packages/vmind/__tests__/unit/vchartSpec/bar.test.ts b/packages/vmind/__tests__/unit/vchartSpec/bar.test.ts
index 656a16d..c9eb1ee 100644
--- a/packages/vmind/__tests__/unit/vchartSpec/bar.test.ts
+++ b/packages/vmind/__tests__/unit/vchartSpec/bar.test.ts
@@ -295,4 +295,22 @@ describe('mergeAppendSpec of barchart', () => {
       }
     ]);
   });
+
+  it('should contain all spec when spec has more than one path', () => {
+    const append = {
+      leafSpec: {
+        mark: {
+          maxLineCount: 20
+        },
+        dimension: {
+          maxLineCount: 20
+        }
+      },
+      parentKeyPath: 'tooltip',
+      aliasKeyPath: 'tooltip'
+    };
+
+    const { newSpec } = mergeAppendSpec(merge({}, spec), append);
+    expect(newSpec.tooltip).toEqual(append.leafSpec);
+  });
 });
diff --git a/packages/vmind/src/atom/VChartSpec/index.ts b/packages/vmind/src/atom/VChartSpec/index.ts
index 453a859..96e2678 100644
--- a/packages/vmind/src/atom/VChartSpec/index.ts
+++ b/packages/vmind/src/atom/VChartSpec/index.ts
@@ -3,6 +3,7 @@ import type { BaseOptions } from '../type';
 import { BaseAtom } from '../base';
 import type { VChartSpecCtx } from '../../types';
 import { mergeAppendSpec } from './utils';
+import { isNil } from '@visactor/vutils';
 
 export class VChartSpec extends BaseAtom<VChartSpecCtx, BaseOptions> {
   name = AtomName.VCHART_SPEC;
@@ -29,15 +30,13 @@ export class VChartSpec extends BaseAtom<VChartSpecCtx, BaseOptions> {
       return this.context;
     }
 
-    if (!appendSpec || !appendSpec.leafSpec) {
-      return this.context;
-    }
+    if (appendSpec && 'leafSpec' in appendSpec) {
+      const { newSpec, code } = mergeAppendSpec(this.context.spec, appendSpec);
 
-    const { newSpec, code } = mergeAppendSpec(this.context.spec, appendSpec);
-
-    this.context.appendCode = code;
-    this.context.prevSpec = this.context.spec;
-    this.context.spec = newSpec;
+      this.context.appendCode = code;
+      this.context.prevSpec = this.context.spec;
+      this.context.spec = newSpec;
+    }
 
     return this.context;
   }