diff --git a/packages/devui-vue/devui/overlay/__tests__/overlay.spec.ts b/packages/devui-vue/devui/overlay/__tests__/overlay.spec.ts
new file mode 100644
index 0000000000..8499b9e6c6
--- /dev/null
+++ b/packages/devui-vue/devui/overlay/__tests__/overlay.spec.ts
@@ -0,0 +1,198 @@
+import { mount } from '@vue/test-utils';
+import { FixedOverlay } from '../src/fixed-overlay';
+import { nextTick } from 'vue';
+import { FlexibleOverlay } from '../src/flexible-overlay';
+import { OriginOrDomRef, Rect, ConnectionPosition } from '../src/overlay-types';
+
+let overlayContianerElement: HTMLElement;
+let origin: OriginOrDomRef;
+
+describe('overlay', () => {
+    beforeEach(() => {
+        const div = document.createElement('div');
+        div.id = 'd-overlay-anchor';
+        document.body.append(div);
+        overlayContianerElement = document.querySelector('#d-overlay-anchor');
+    })
+
+    describe('fixed overlay', () => {
+
+        it('should be create', async() => {
+            const wrapper = mount(FixedOverlay, {
+                props: {
+                    visible: true
+                }
+            })
+            await nextTick();
+            let bgElement = overlayContianerElement.querySelector('.devui-overlay-background') as HTMLElement;
+            expect(bgElement.getAttribute('style')).toBeNull();
+            await wrapper.setProps({visible: false});
+            await nextTick();
+            bgElement = overlayContianerElement.querySelector('.devui-overlay-background') as HTMLElement;
+            expect(bgElement.style.display).toBe('none');
+            wrapper.unmount()
+        })
+        it('test backgroundClass, backgroundStyle, overlayStyle', async() => {
+            const wrapper = mount(FixedOverlay, {
+                props: {
+                    visible: true,
+                    backgroundClass: 'bgColor',
+                    backgroundStyle: 'width: 100px',
+                    overlayStyle: 'width: 100%'
+                }
+            })
+            await nextTick();
+            const bgElement = overlayContianerElement.querySelector('.devui-overlay-background') as HTMLElement;
+            expect(bgElement.classList).toContain('bgColor');
+            expect(bgElement.style.width).toBe('100px');
+            expect((overlayContianerElement.querySelector('.devui-overlay') as HTMLElement).style.width).toBe('100%');
+            wrapper.unmount();
+        })
+        it('test hasBackdrop', async() => {
+            const wrapper = mount(FixedOverlay, {
+                props: {
+                    visible: true,
+                    hasBackdrop: false
+                }
+            })
+            await nextTick();
+            let bgElement = overlayContianerElement.querySelector('.devui-overlay-background') as HTMLElement;
+            expect(bgElement.classList).toContain('devui-overlay-background__disabled');
+            await wrapper.setProps({hasBackdrop: true});
+            await nextTick();
+            bgElement = overlayContianerElement.querySelector('.devui-overlay-background') as HTMLElement;
+            expect(bgElement.classList).toContain('devui-overlay-background__color');
+            wrapper.unmount();
+        })
+        it('test emit update:visible and onBackdropClick', async() => {
+            const wrapper = mount(FixedOverlay, {
+                props: {
+                    visible: true
+                }
+            })
+            await nextTick();
+            const bgElement = overlayContianerElement.querySelector('.devui-overlay-background') as HTMLElement;
+            const fn = jest.fn();
+            await wrapper.setProps({onBackdropClick: fn})
+            bgElement.click();
+            expect(wrapper.emitted('update:visible').length).toBe(1);
+            expect(fn).toHaveBeenCalled();
+            wrapper.unmount();
+        })
+    })
+
+    describe('flexible overlay', () => {
+        beforeEach(() => {
+            origin = {x:100, y: 100, width: 100, height: 100} as Rect;
+            // 解决 ResizeObserver is not defined
+            global.ResizeObserver = window.ResizeObserver || jest.fn().mockImplementation(() => ({
+                disconnect: jest.fn(),
+                observe: jest.fn(),
+                unobserve: jest.fn(),
+            }));
+        })
+
+        it('should be creat', async() => {
+            const wrapper = mount(FlexibleOverlay, {
+                props: {
+                    origin: origin,
+                    visible: true
+                }
+            })
+            await nextTick();
+            let bgElement = overlayContianerElement.querySelector('.devui-overlay-background') as HTMLElement;
+            expect(bgElement.getAttribute('style')).toBeNull();
+            await wrapper.setProps({ visible: false });
+            await nextTick();
+            bgElement = overlayContianerElement.querySelector('.devui-overlay-background') as HTMLElement;
+            expect(bgElement.style.display).toBe('none');
+            wrapper.unmount();
+        })
+        it('test backgroundClass, backgroundStyle', async() => {
+            const wrapper = mount(FlexibleOverlay, {
+                props: {
+                    origin: origin,
+                    visible: true,
+                    backgroundClass: 'bgColor',
+                    backgroundStyle: 'width: 100px'
+                }
+            })
+            await nextTick();
+            const bgElement = overlayContianerElement.querySelector('.devui-overlay-background') as HTMLElement;
+            expect(bgElement.classList).toContain('bgColor');
+            expect(bgElement.style.width).toBe('100px');
+            wrapper.unmount();
+        })
+        it('test hasBackdrop', async() => {
+            const wrapper = mount(FlexibleOverlay, {
+                props: {
+                    origin: origin,
+                    visible: true,
+                    hasBackdrop: false
+                }
+            })
+            await nextTick();
+            let bgElement = overlayContianerElement.querySelector('.devui-overlay-background') as HTMLElement;
+            expect(bgElement.classList).toContain('devui-overlay-background__disabled');
+            await wrapper.setProps({hasBackdrop: true});
+            await nextTick();
+            bgElement = overlayContianerElement.querySelector('.devui-overlay-background') as HTMLElement;
+            expect(bgElement.classList).toContain('devui-overlay-background__color');
+            wrapper.unmount();
+        })
+        it('test emit update:visible and onBackdropClick', async() => {
+            const wrapper = mount(FlexibleOverlay, {
+                props: {
+                    origin: origin,
+                    visible: true
+                }
+            })
+            await nextTick();
+            const bgElement = overlayContianerElement.querySelector('.devui-overlay-background') as HTMLElement;
+            const fn = jest.fn();
+            await wrapper.setProps({onBackdropClick: fn})
+            bgElement.click();
+            expect(wrapper.emitted('update:visible').length).toBe(1);
+            expect(fn).toHaveBeenCalled();
+            wrapper.unmount();
+        })
+        it('test position', async() => {
+            const position = {
+                originX: 'left', 
+                originY: 'top', 
+                overlayX: 'left', 
+                overlayY: 'top'
+            } as ConnectionPosition
+            const wrapper = mount(FlexibleOverlay, {
+                props: {
+                    origin: origin,
+                    visible: true,
+                },
+                slots: {
+                    default: '<div style="width:100px; height: 100px;"></div>'
+                }
+            })
+            await wrapper.setProps({position: position})
+            await nextTick();
+            let overlayElement = overlayContianerElement.querySelector('.devui-overlay') as HTMLElement;
+            expect(overlayElement.style.left).toBe('100px');
+            expect(overlayElement.style.top).toBe('100px');
+            position.originX = 'center';
+            position.originY = 'center';
+            await wrapper.setProps({position: Object.assign({}, position)})
+            await nextTick();
+            overlayElement = overlayContianerElement.querySelector('.devui-overlay') as HTMLElement;
+            expect(overlayElement.style.left).toBe('150px');
+            expect(overlayElement.style.top).toBe('150px');
+            position.originX = 'right';
+            position.originY = 'bottom'
+            await wrapper.setProps({position: Object.assign({}, position)})
+            await nextTick();
+            overlayElement = overlayContianerElement.querySelector('.devui-overlay') as HTMLElement;
+            expect(overlayElement.style.left).toBe('200px');
+            expect(overlayElement.style.top).toBe('200px');
+            wrapper.unmount();
+        })
+    })
+})
+