diff --git a/test/unit/specs/affix.spec.js b/test/unit/specs/affix.spec.js
new file mode 100644
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--- /dev/null
+++ b/test/unit/specs/affix.spec.js
@@ -0,0 +1,137 @@
+import { createVue, destroyVM } from '../util';
+
+describe('Affix.vue', () => {
+  let vm;
+  afterEach(() => {
+    destroyVM(vm);
+  });
+
+  it('should create a Affix component without slot', done => {
+    vm = createVue('<Affix></Affix>');
+    const affix = vm.$el.children[0];
+    
+    expect(affix.tagName).to.equal('DIV');
+    expect(affix.className).to.equal('');
+    done();
+  });
+
+  it('should create a Affix component contain slot', done => {
+    vm = createVue(`
+        <Affix>
+            <span class="demo-affix">Fixed at the top</span>
+        </Affix>
+    `);
+    const slot = vm.$el.children[0].children[0];
+
+    expect(slot.tagName).to.equal('SPAN');
+    expect(slot.className).to.equal('demo-affix');
+    done();
+  });
+
+  it('only set offset-top props', done => {
+    vm = createVue(`
+    <div>
+        <Affix :offset-top="20">
+            <span class="demo-affix">Fixed at the top</span>
+        </Affix>
+        <div style="width: 100%; height: 2000px"></div>
+    </div>
+    `, true);
+    const affix = vm.$el.children[0].children[0];
+    const fakeBlock = vm.$el.children[0].children[1];
+
+    expect(affix.classList.contains('ivu-affix')).to.false;
+    expect(affix.style.top).to.equal('');
+    expect(fakeBlock.style.display).to.equal('none');
+    window.scrollTo(0, 10000);
+    setTimeout(()=>{
+      expect(affix.classList.contains('ivu-affix')).to.true;
+      expect(affix.style.top).to.equal('20px');
+      expect(fakeBlock.style.display).to.equal('');
+      done();
+    }, 100);
+  });
+
+  it('only set offset-bottom props', done => {
+    vm = createVue(`
+    <div>
+        <div style="width: 100%; height: 2000px"></div>
+        <Affix :offset-bottom="20">
+            <span class="demo-affix">Fixed at the top</span>
+        </Affix>
+        <div style="width: 100%; height: 2000px"></div>
+    </div>
+    `, true);
+    const affix = vm.$el.children[1].children[0];
+
+    expect(affix.classList.contains('ivu-affix')).to.false;
+    expect(affix.style.bottom).to.equal('');
+    // Affix component haven't run handleScroll function when component mounted in real dom.
+    // use scrollTo() to trigger scroll event.
+    window.scrollTo(0, 100);
+    setTimeout(()=>{
+      expect(affix.classList.contains('ivu-affix')).to.true;
+      expect(affix.style.bottom).to.equal('20px');
+      window.scrollTo(0, 10000);
+      setTimeout(()=>{
+        expect(affix.classList.contains('ivu-affix')).to.false;
+        expect(affix.style.bottom).to.equal('');
+        done();
+      }, 100);
+    }, 100);
+  });
+
+  it('both props are set, only offset-bottom is valid', done => {
+    vm = createVue(`
+    <div>
+        <div style="width: 100%; height: 2000px"></div>
+        <Affix :offset-bottom="20" :offset-top="20">
+            <span class="demo-affix">Fixed at the top</span>
+        </Affix>
+        <div style="width: 100%; height: 2000px"></div>
+    </div>
+    `, true);
+    const affix = vm.$el.children[1].children[0];
+
+    expect(affix.classList.contains('ivu-affix')).to.false;
+    expect(affix.style.bottom).to.equal('');
+    // Affix component haven't run handleScroll function when component mounted in real dom.
+    // use scrollTo() to trigger scroll event.
+    window.scrollTo(0, 100);
+    setTimeout(()=>{
+      expect(affix.classList.contains('ivu-affix')).to.true;
+      expect(affix.style.bottom).to.equal('20px');
+      window.scrollTo(0, 10000);
+      setTimeout(()=>{
+        expect(affix.classList.contains('ivu-affix')).to.false;
+        expect(affix.style.bottom).to.equal('');
+        done();
+      }, 100);
+    }, 100);
+  });
+
+  it('both props are not set, should fixed top and top equal 0px', done => {
+    vm = createVue(`
+    <div>
+        <Affix>
+            <span class="demo-affix">Fixed at the top</span>
+        </Affix>
+        <div style="width: 100%; height: 2000px"></div>
+    </div>
+    `, true);
+    const affix = vm.$el.children[0].children[0];
+    const fakeBlock = vm.$el.children[0].children[1];
+    
+    expect(affix.classList.contains('ivu-affix')).to.false;
+    expect(affix.style.top).to.equal('');
+    expect(fakeBlock.style.display).to.equal('none');
+    window.scrollTo(0, 10000);
+    setTimeout(()=>{
+      expect(affix.classList.contains('ivu-affix')).to.true;
+      expect(affix.style.top).to.equal('0px');
+      expect(fakeBlock.style.display).to.equal('');
+      done();
+    }, 100);
+  });
+
+});
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