The Search Engine and Web Mining (SEWM) Group, part of the network lab of Department of Computer Science and Technology, Peking University, has a strong research history in the search engine area since the web inception in China. The group plays a leading role in the search engine community. Tianwang search engine is one of the most famous search engines in China since 1997. In particular, the SEWM group has been developing Tianwang for over 10 years.

The group has vigorously technical advantages in incremental crawling, full-text indexing and retrieving, and web archiving. Beginning in 2001, the group started to collect and archive web pages within the scope of China and engineer the Chinese Web Archive - Web Infomall. As of today, Web Infomall has accumulated over 3 billions web pages published in the past years, and stands as the second-largest web archives in the world after the Internet Archive.

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