Following the energetical development of engineering construction，basement excavation is developing to deep and large direction， and the surrounding condition is getting more and more complicated. According to an engineering project，deep and large pit scheme analysis is conducted in detail. The foundation pit is adjacent to using metro， proposed metro， large residential district， existing office， municipal road， et al，and the surrounding environment is primary complicated. Foundation pit circumference is even 1000 m，excavating depth is even 16.0 ~ 20.0 m，and it is typical deep and large foundation pit. By multi-scheme comparison， the foundation pit support is picked up，and the scheme includes rowed pile and internal support， rowed pile and anchor， rowed pile and steel inclined brace， et al. The design scheme is adjusted in the whole construction process according to monitoring data and the surrounding condition change. The foundation pit is constructed in block lasting 3 years and leading twice delayed conference. However，there is no substance safety accident in the whole construction process， and the expected effect is achieved. The engineering project can provide reference for similar projects.