diff --git a/components/form/FormItem.tsx b/components/form/FormItem.tsx
index b4807c176d..077c2ebf23 100644
--- a/components/form/FormItem.tsx
+++ b/components/form/FormItem.tsx
@@ -258,7 +258,7 @@ function FormItem(props: FormItemProps): React.ReactElement {
           nameRef.current = [...mergedName];
           if (fieldKey) {
             const fieldKeys = Array.isArray(fieldKey) ? fieldKey : [fieldKey];
-            nameRef.current = [...mergedName.slice(-1), ...fieldKeys];
+            nameRef.current = [...mergedName.slice(0, -1), ...fieldKeys];
           }
           updateItemErrors(nameRef.current.join('__SPLIT__'), errors);
         }
diff --git a/components/form/__tests__/index.test.js b/components/form/__tests__/index.test.js
index 4e84bc26e5..b80f563a7f 100644
--- a/components/form/__tests__/index.test.js
+++ b/components/form/__tests__/index.test.js
@@ -10,11 +10,6 @@ import { sleep } from '../../../tests/utils';
 
 jest.mock('scroll-into-view-if-needed');
 
-const delay = (timeout = 0) =>
-  new Promise(resolve => {
-    setTimeout(resolve, timeout);
-  });
-
 describe('Form', () => {
   mountTest(Form);
   mountTest(Form.Item);
@@ -27,7 +22,7 @@ describe('Form', () => {
 
   async function change(wrapper, index, value) {
     wrapper.find(Input).at(index).simulate('change', { target: { value } });
-    await delay(50);
+    await sleep(100);
     wrapper.update();
   }
 
@@ -45,133 +40,6 @@ describe('Form', () => {
     scrollIntoView.mockRestore();
   });
 
-  describe('List', () => {
-    function testList(name, renderField) {
-      it(name, async () => {
-        const wrapper = mount(
-          <Form>
-            <Form.List name="list">
-              {(fields, { add, remove }) => (
-                <>
-                  {fields.map(field => renderField(field))}
-                  <Button className="add" onClick={add}>
-                    Add
-                  </Button>
-                  <Button
-                    className="remove"
-                    onClick={() => {
-                      remove(1);
-                    }}
-                  >
-                    Remove
-                  </Button>
-                </>
-              )}
-            </Form.List>
-          </Form>,
-        );
-
-        async function operate(className) {
-          wrapper.find(className).last().simulate('click');
-          await delay();
-          wrapper.update();
-        }
-
-        await operate('.add');
-        expect(wrapper.find(Input).length).toBe(1);
-
-        await operate('.add');
-        expect(wrapper.find(Input).length).toBe(2);
-
-        await change(wrapper, 1, '');
-        wrapper.update();
-        await sleep(300);
-        expect(wrapper.find('.ant-form-item-explain').length).toBe(1);
-
-        await operate('.remove');
-        wrapper.update();
-        expect(wrapper.find(Input).length).toBe(1);
-        expect(wrapper.find('.ant-form-item-explain').length).toBe(0);
-      });
-    }
-
-    testList('operation correctly', field => (
-      <Form.Item {...field} rules={[{ required: true }]}>
-        <Input />
-      </Form.Item>
-    ));
-
-    testList('nest noStyle', field => (
-      <Form.Item key={field.key}>
-        <Form.Item noStyle {...field} rules={[{ required: true }]}>
-          <Input />
-        </Form.Item>
-      </Form.Item>
-    ));
-
-    it('correct onFinish values', async () => {
-      async function click(wrapper, className) {
-        wrapper.find(className).last().simulate('click');
-        await delay();
-        wrapper.update();
-      }
-
-      const onFinish = jest.fn().mockImplementation(() => {});
-
-      const wrapper = mount(
-        <Form
-          onFinish={v => {
-            if (typeof v.list[0] === 'object') {
-              /* old version led to SyntheticEvent be passed as an value here
-                that led to weird infinite loop somewhere and OutOfMemory crash */
-              v = new Error('We expect value to be a primitive here');
-            }
-            onFinish(v);
-          }}
-        >
-          <Form.List name="list">
-            {(fields, { add, remove }) => (
-              <>
-                {fields.map(field => (
-                  // key is in a field
-                  // eslint-disable-next-line react/jsx-key
-                  <Form.Item {...field}>
-                    <Input />
-                  </Form.Item>
-                ))}
-                <Button className="add" onClick={add}>
-                  Add
-                </Button>
-                <Button className="remove" onClick={() => remove(0)}>
-                  Remove
-                </Button>
-              </>
-            )}
-          </Form.List>
-        </Form>,
-      );
-
-      await click(wrapper, '.add');
-      await change(wrapper, 0, 'input1');
-      wrapper.find('form').simulate('submit');
-      await delay();
-      expect(onFinish).toHaveBeenLastCalledWith({ list: ['input1'] });
-
-      await click(wrapper, '.add');
-      await change(wrapper, 1, 'input2');
-      await click(wrapper, '.add');
-      await change(wrapper, 2, 'input3');
-      wrapper.find('form').simulate('submit');
-      await delay();
-      expect(onFinish).toHaveBeenLastCalledWith({ list: ['input1', 'input2', 'input3'] });
-
-      await click(wrapper, '.remove'); // will remove first input
-      wrapper.find('form').simulate('submit');
-      await delay();
-      expect(onFinish).toHaveBeenLastCalledWith({ list: ['input2', 'input3'] });
-    });
-  });
-
   it('noStyle Form.Item', async () => {
     const onChange = jest.fn();
 
@@ -300,7 +168,7 @@ describe('Form', () => {
 
     expect(scrollIntoView).not.toHaveBeenCalled();
     wrapper.find('form').simulate('submit');
-    await delay(50);
+    await sleep(50);
     expect(scrollIntoView).toHaveBeenCalled();
     expect(onFinishFailed).toHaveBeenCalled();
 
@@ -401,7 +269,7 @@ describe('Form', () => {
       expect(wrapper.find('.ant-form-item-explain').first().text()).toEqual("'name' is required");
 
       await change(wrapper, 0, 'p');
-      await delay(100);
+      await sleep(100);
       wrapper.update();
       expect(wrapper.find('.ant-form-item-explain').first().text()).toEqual('not a p');
     }
@@ -585,9 +453,9 @@ describe('Form', () => {
     );
 
     wrapper.find('form').simulate('submit');
-    await delay(100);
+    await sleep(100);
     wrapper.update();
-    await delay(100);
+    await sleep(100);
     expect(wrapper.find('.ant-form-item-explain').first().text()).toEqual('Bamboo is good!');
   });
 
@@ -642,7 +510,7 @@ describe('Form', () => {
       },
     });
 
-    await delay();
+    await sleep();
 
     expect(renderTimes).toEqual(1);
     expect(wrapper.find('input').props().value).toEqual('a');
diff --git a/components/form/__tests__/list.test.js b/components/form/__tests__/list.test.js
new file mode 100644
index 0000000000..d966649a0b
--- /dev/null
+++ b/components/form/__tests__/list.test.js
@@ -0,0 +1,167 @@
+import React from 'react';
+import { mount } from 'enzyme';
+import raf from 'raf';
+import { act } from 'react-dom/test-utils';
+import Form from '..';
+import Input from '../../input';
+import Button from '../../button';
+import { sleep } from '../../../tests/utils';
+
+jest.mock('raf');
+
+describe('Form.List', () => {
+  raf.mockImplementation(callback => window.setTimeout(callback));
+
+  afterAll(() => {
+    raf.mockRestore();
+  });
+
+  async function change(wrapper, index, value) {
+    wrapper.find(Input).at(index).simulate('change', { target: { value } });
+    await sleep();
+    wrapper.update();
+  }
+
+  function testList(name, renderField) {
+    it(name, async () => {
+      jest.useFakeTimers();
+
+      const wrapper = mount(
+        <Form>
+          <Form.List name="list">
+            {(fields, { add, remove }) => (
+              <>
+                {fields.map(field => renderField(field))}
+                <Button className="add" onClick={add}>
+                  Add
+                </Button>
+                <Button
+                  className="remove-0"
+                  onClick={() => {
+                    remove(0);
+                  }}
+                />
+                <Button
+                  className="remove-1"
+                  onClick={() => {
+                    remove(1);
+                  }}
+                />
+              </>
+            )}
+          </Form.List>
+        </Form>,
+      );
+
+      function operate(className) {
+        act(() => {
+          wrapper.find(className).last().simulate('click');
+          jest.runAllTimers();
+        });
+        wrapper.update();
+      }
+
+      operate('.add');
+      expect(wrapper.find(Input).length).toBe(1);
+
+      operate('.add');
+      expect(wrapper.find(Input).length).toBe(2);
+
+      operate('.add');
+      expect(wrapper.find(Input).length).toBe(3);
+
+      await change(wrapper, 2, '');
+      act(() => {
+        jest.runAllTimers();
+      });
+      wrapper.update();
+      expect(wrapper.find('.ant-form-item-explain div').length).toBe(1);
+
+      operate('.remove-0');
+      expect(wrapper.find(Input).length).toBe(2);
+      expect(wrapper.find('.ant-form-item-explain div').length).toBe(1);
+
+      operate('.remove-1');
+      expect(wrapper.find(Input).length).toBe(1);
+      expect(wrapper.find('.ant-form-item-explain div').length).toBe(0);
+
+      jest.useRealTimers();
+    });
+  }
+
+  testList('operation correctly', field => (
+    <Form.Item {...field} rules={[{ required: true }]}>
+      <Input />
+    </Form.Item>
+  ));
+
+  testList('nest noStyle', field => (
+    <Form.Item key={field.key}>
+      <Form.Item noStyle {...field} rules={[{ required: true }]}>
+        <Input />
+      </Form.Item>
+    </Form.Item>
+  ));
+
+  it('correct onFinish values', async () => {
+    async function click(wrapper, className) {
+      wrapper.find(className).last().simulate('click');
+      await sleep();
+      wrapper.update();
+    }
+
+    const onFinish = jest.fn().mockImplementation(() => {});
+
+    const wrapper = mount(
+      <Form
+        onFinish={v => {
+          if (typeof v.list[0] === 'object') {
+            /* old version led to SyntheticEvent be passed as an value here
+              that led to weird infinite loop somewhere and OutOfMemory crash */
+            v = new Error('We expect value to be a primitive here');
+          }
+          onFinish(v);
+        }}
+      >
+        <Form.List name="list">
+          {(fields, { add, remove }) => (
+            <>
+              {fields.map(field => (
+                // key is in a field
+                // eslint-disable-next-line react/jsx-key
+                <Form.Item {...field}>
+                  <Input />
+                </Form.Item>
+              ))}
+              <Button className="add" onClick={add}>
+                Add
+              </Button>
+              <Button className="remove" onClick={() => remove(0)}>
+                Remove
+              </Button>
+            </>
+          )}
+        </Form.List>
+      </Form>,
+    );
+
+    await click(wrapper, '.add');
+    await change(wrapper, 0, 'input1');
+    wrapper.find('form').simulate('submit');
+    await sleep();
+    expect(onFinish).toHaveBeenLastCalledWith({ list: ['input1'] });
+
+    await click(wrapper, '.add');
+    await change(wrapper, 1, 'input2');
+    await click(wrapper, '.add');
+    await change(wrapper, 2, 'input3');
+    wrapper.find('form').simulate('submit');
+    await sleep();
+    expect(onFinish).toHaveBeenLastCalledWith({ list: ['input1', 'input2', 'input3'] });
+
+    await click(wrapper, '.remove'); // will remove first input
+    wrapper.find('form').simulate('submit');
+    await sleep();
+    expect(onFinish).toHaveBeenLastCalledWith({ list: ['input2', 'input3'] });
+  });
+});
diff --git a/components/form/util.ts b/components/form/util.ts
index 2ab1242cb6..93fd896890 100644
--- a/components/form/util.ts
+++ b/components/form/util.ts
@@ -21,19 +21,19 @@ export function useCacheErrors(
 
   const [, forceUpdate] = React.useState({});
 
-  const update = () => {
+  const update = (newErrors: React.ReactNode[]) => {
     const prevVisible = cacheRef.current.visible;
-    const newVisible = !!errors.length;
+    const newVisible = !!newErrors.length;
 
     const prevErrors = cacheRef.current.errors;
-    cacheRef.current.errors = errors;
+    cacheRef.current.errors = newErrors;
     cacheRef.current.visible = newVisible;
 
     if (prevVisible !== newVisible) {
       changeTrigger(newVisible);
     } else if (
-      prevErrors.length !== errors.length ||
-      prevErrors.some((prevErr, index) => prevErr !== errors[index])
+      prevErrors.length !== newErrors.length ||
+      prevErrors.some((prevErr, index) => prevErr !== newErrors[index])
     ) {
       forceUpdate({});
     }
@@ -41,13 +41,17 @@ export function useCacheErrors(
 
   React.useEffect(() => {
     if (!directly) {
-      const timeout = setTimeout(update, 10);
-      return () => clearTimeout(timeout);
+      const timeout = setTimeout(() => {
+        update(errors);
+      }, 10);
+      return () => {
+        clearTimeout(timeout);
+      };
     }
   }, [errors]);
 
   if (directly) {
-    update();
+    update(errors);
   }
 
   return [cacheRef.current.visible, cacheRef.current.errors];
diff --git a/tests/utils.ts b/tests/utils.ts
index 53b05cc741..c6914d0afd 100644
--- a/tests/utils.ts
+++ b/tests/utils.ts
@@ -8,4 +8,6 @@ export function resetMockDate() {
   MockDate.reset();
 }
 
-export const sleep = (timeout = 0) => new Promise(resolve => setTimeout(resolve, timeout));
+const globalTimeout = global.setTimeout;
+
+export const sleep = (timeout = 0) => new Promise(resolve => globalTimeout(resolve, timeout));