diff --git a/packages/core/client-v2/src/flow/components/FieldAssignValueInput.tsx b/packages/core/client-v2/src/flow/components/FieldAssignValueInput.tsx
index 3f54c53a160..cfff56e249f 100644
--- a/packages/core/client-v2/src/flow/components/FieldAssignValueInput.tsx
+++ b/packages/core/client-v2/src/flow/components/FieldAssignValueInput.tsx
@@ -1028,18 +1028,22 @@ export const FieldAssignValueInput: React.FC<Props> = ({
       collectionField: effectiveCollectionField,
     });
 
-    const created = engine?.createModel?.({
-      use: 'VariableFieldFormModel',
-      subModels: {
-        fields: [
-          {
-            use: effectiveFieldModelUse,
-            stepParams: tempFieldStepParams,
-            props: tempFieldProps,
-          },
-        ],
+    const sourceContext = resolved?.itemModel?.context || flowCtx.model?.context;
+    const created = engine?.createModel?.(
+      {
+        use: 'VariableFieldFormModel',
+        subModels: {
+          fields: [
+            {
+              use: effectiveFieldModelUse,
+              stepParams: tempFieldStepParams,
+              props: tempFieldProps,
+            },
+          ],
+        },
       },
-    });
+      sourceContext ? { delegate: sourceContext } : undefined,
+    );
     if (!created) return;
 
     // 注入上下文（集合/数据源/字段/区块/资源）
diff --git a/packages/core/client-v2/src/flow/components/__tests__/FieldAssignValueInput.context.test.tsx b/packages/core/client-v2/src/flow/components/__tests__/FieldAssignValueInput.context.test.tsx
new file mode 100644
index 00000000000..58bdfcee37d
--- /dev/null
+++ b/packages/core/client-v2/src/flow/components/__tests__/FieldAssignValueInput.context.test.tsx
@@ -0,0 +1,134 @@
+/**
+ * This file is part of the NocoBase (R) project.
+ * Copyright (c) 2020-2024 NocoBase Co., Ltd.
+ * Authors: NocoBase Team.
+ *
+ * This project is dual-licensed under AGPL-3.0 and NocoBase Commercial License.
+ * For more information, please refer to: https://www.nocobase.com/agreement.
+ */
+
+import React from 'react';
+import { describe, expect, it, vi } from 'vitest';
+import { render, waitFor } from '@nocobase/test/client';
+import { FieldAssignValueInput } from '../FieldAssignValueInput';
+
+const { mockUseFlowContext, mockGetDefaultBindingByField } = vi.hoisted(() => ({
+  mockUseFlowContext: vi.fn(),
+  mockGetDefaultBindingByField: vi.fn(),
+}));
+
+vi.mock('@nocobase/flow-engine', async () => {
+  const actual = await vi.importActual<typeof import('@nocobase/flow-engine')>('@nocobase/flow-engine');
+  class MockEditableItemModel extends actual.EditableItemModel {}
+  MockEditableItemModel.getDefaultBindingByField = mockGetDefaultBindingByField;
+
+  return {
+    ...actual,
+    useFlowContext: () => mockUseFlowContext(),
+    VariableInput: () => <div data-testid="variable-input" />,
+    FlowModelRenderer: () => <div data-testid="flow-model-renderer" />,
+    EditableItemModel: MockEditableItemModel,
+  };
+});
+
+describe('FieldAssignValueInput context', () => {
+  it('delegates temporary field model context to the source form context', async () => {
+    type MockContext = {
+      dataSourceManager: { getDataSource: ReturnType<typeof vi.fn> };
+      t: (key: string) => string;
+      engine?: { createModel: ReturnType<typeof vi.fn> };
+      collection?: MockCollection;
+      blockModel?: MockFormModel;
+    };
+    type MockFieldModel = {
+      props: Record<string, unknown>;
+      setProps: ReturnType<typeof vi.fn>;
+      dispatchEvent: ReturnType<typeof vi.fn>;
+      remove: ReturnType<typeof vi.fn>;
+    };
+    type MockCollectionField = {
+      name: string;
+      interface: string;
+      uiSchema: { enum: Array<{ label: string; value: string }> };
+      isAssociationField: () => boolean;
+      getComponentProps: () => Record<string, unknown>;
+    };
+    type MockCollection = {
+      dataSourceKey: string;
+      name: string;
+      getField: (name: string) => MockCollectionField | null;
+      getFields: () => MockCollectionField[];
+    };
+    type MockFormModel = {
+      context: MockContext;
+      collection: MockCollection;
+      subModels: Record<string, unknown>;
+    };
+
+    const sourceContext: MockContext = {
+      dataSourceManager: {
+        getDataSource: vi.fn(() => ({})),
+      },
+      t: (key: string) => key,
+    };
+    const fieldModel: MockFieldModel = {
+      props: {},
+      setProps: vi.fn((props: Record<string, unknown>) => {
+        fieldModel.props = { ...fieldModel.props, ...props };
+      }),
+      dispatchEvent: vi.fn(),
+      remove: vi.fn(),
+    };
+    const tempRoot = {
+      context: {
+        defineProperty: vi.fn(),
+      },
+      subModels: {
+        fields: [fieldModel],
+      },
+      setProps: vi.fn(),
+      remove: vi.fn(),
+    };
+    const engine = {
+      createModel: vi.fn(() => tempRoot),
+    };
+    sourceContext.engine = engine;
+
+    const collectionField: MockCollectionField = {
+      name: 'status',
+      interface: 'select',
+      uiSchema: {
+        enum: [{ label: 'Open', value: 'open' }],
+      },
+      isAssociationField: () => false,
+      getComponentProps: () => ({}),
+    };
+    const collection: MockCollection = {
+      dataSourceKey: 'main',
+      name: 'tasks',
+      getField: (name: string) => (name === 'status' ? collectionField : null),
+      getFields: () => [collectionField],
+    };
+    const formModel: MockFormModel = {
+      context: sourceContext,
+      collection,
+      subModels: {},
+    };
+    sourceContext.collection = collection;
+    sourceContext.blockModel = formModel;
+
+    mockGetDefaultBindingByField.mockReturnValue({ modelName: 'SelectFieldModel' });
+    mockUseFlowContext.mockReturnValue({
+      model: formModel,
+      t: (key: string) => key,
+      getPropertyMetaTree: vi.fn(async () => []),
+    });
+
+    render(<FieldAssignValueInput targetPath="status" value="" onChange={vi.fn()} />);
+
+    await waitFor(() => {
+      expect(engine.createModel).toHaveBeenCalled();
+    });
+    expect(engine.createModel).toHaveBeenCalledWith(expect.any(Object), { delegate: sourceContext });
+  });
+});