Because the version of the elementui is inconsistent. The default form element of the elementui version in vue-cli is centered. By contrast, it is found that the version of elementui in vue-cli has text-align="center "by default, so they are all centered. We just need to add a text-align="left "to change it to what we want. Element-ui is a ui library and does not depend on vue. However, cooperating with vue in project development is a good ui framework.