| With the 20 years opening-up and development in China , the scale of the civil engineering construction is broadening and the difficulty is enhanced, too. It is the characteristics of modern civil engineering that includes the civil engineering's functionization, the city construction's tridimensionalization ,the modernization of traffic and the improving the living condition. The foundation is faced a higher requirement due to the modern civil engineering construction. With the development of modernization in our country, it is necessary for us to deal with the natural foundation in order to satisfy this requirement.The dry-cement jet mixing pile composite foundation is one of methods to the foundation improvement, because of its low price, construction high speed ,no noise and no pollution, etc.. it is widely used in varied projects and has its own comprehensive prospect. But there are many insure factors, complexity and difficulties of the DJM pile composite foundation. What we know about it is narrow, which results in engineering's insecurity and waste in practice. Hence , to assure the safety and economic, it is urgent to further study the bearing performances of the DJM pile composite foundation ,in which we can combine the theory with practice.In this paper, which is based on the formers' theories and experimentations, numerical emulation experimentations are carried out on the bearing performances of the DJM pile composite foundation by using the finite element method(FEM) software of ANSYS. Through this method we can obtain the factors that influence the bearing performances of the single DJM pile composite foundation and the regularities according to the changes of these factors; then ,on the basis of them, we study the bearing performances of the multi-DJM piles composite foundation and acquire the regularities of them that are changed with the changes of the factors. The conclusions we get will be of some value in the engineering practice and construction.
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