Search engine marketing is one of the most commonly used methods of online marketing. With the increasingly perfect online marketing environment and the continuous emergence of new online marketing methods, although search engine marketing is no longer the core of online marketing, search engines remain a fundamental way for people to discover new websites. Moreover, search engines themselves continue to evolve, and marketing techniques based on them have developed beyond just free directory submissions. They have progressed to deeper levels, such as advanced service-providing search engine optimization (SEO), keyword advertising, keyword bidding for rankings, and content-targeted online advertisements. As major domestic search engines fully embrace paid submission, this has not diminished people's enthusiasm for using search engines. Therefore, getting listed in search engines and achieving good rankings remains one of the basic tasks for website promotion.