Search logs are very precious for information retrieval studies. In this chapter, we will introduce a real Chinese query log dataset, SogouQ, which was released by SogouQ corporation in 2010 for the NTCIR-9 Intent task. SogouQ contains more than 30 million clicks collected in 2008. It is the first large-scale query logs used in a shared-task evaluation (i.e., the NTCIR tasks). SogouQ has been adopted in a number of follow-up evaluation tasks, NTCIR-10 Intent-2, NTCIR-11 IMine, NTCIR-12 IMine-2, as well as in several Chinese domestic tasks. Moreover, SogouQ has a broader impact on other research areas, such as natural language processing and social science. It has been acquired by more than 200 institutions.