| The spallation neutron source is a large scientific experimental device, its construction can lead the development of many disciplines. Because neutron have many characteristic such as noncharged penetrating and so on. The scientists have been eager to develop it to neutron scattering techniques since it has been discovered.China Spallation Neutron Source (CSNS) is builded under the needs of domestic scientific research, and aimed to improve our level of scientific research to a international level. After building CSNS, China will become the first developing countriy who has the spallation neutron source.In this paper, we use the general Monte Carlo program MCNP to model,simulat and compute the target station of CSNS, including the computing of the moderator and shield, analysis of the computing results and so on, which can provide some usefull information for the construction of CSNS.This paper first test the effects of beryllium reflector. We estabilished a simple sphere model to compute the surface neutron flux of each surface with beryllium of different thickness, and then found the relationship between beryllium's reflection and it's thickness with the simulating results'analysis.Next, we tested the moderat capability of three different moderator (liquid methane, liquid hydrogen and water), compute the neutron flux of those three moderator when they are working, and also test their moderat capability and gave the test result's analysis.At last, we modeled the whole CSNS's target station system by using the MCNP program, which was filled with the real material. In this process, a high-speed computer was used to execute a huge number of computing, and the reliable results had been achieved.
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