Abstract: The development and utilization of underground space makes underground building became a very important part in the engineering. Underground space and is closely related to the condition of geotechnical engineering, and the direct interaction of the condition raises related questions. Anti-floating of underground construction is one of the most important security issues. Different companies use different methods of anti-floating in different regions. For many years, after the study of geotechnical engineering practice, anti-float anchor became an important way for underground construction of anti-floating. The design and construction of anti-float anchor are practiced in a lot of ways. The design and practical effect of anti-float anchor in soil are studied in Beijing. The construction technology of continuous flight auger drilling and post-inserting main reinforcement is promoted and practiced, and the results are summarized to guide the same engineering practices.