The purpose of rebuilding a website is to achieve better performance. Therefore, the first thing to do is to think about what new form the new website should take using SEO. Unlike the situation where there was never a website before, during the construction of the new website, it is necessary to consider maintaining the existing rankings of the original website, especially the rankings of some important keywords. So how can we protect the search engine rankings? Search engines are very sensitive to website updates. Small changes, some even just like giving a webpage a makeover or dressing up, can cause significant ranking fluctuations.