A three-dimension finite element simulation for the model of three-dimensional network structure foam was made by ANSYS software in this paper. Influence of magnitude of load, loading position and volume fraction on the compressive strength of SiC foam three-dimensional network structure was investigated. The results show that with the increase of magnitude of load and the decrease of volume fraction, the compressive strength of foam decreases gradually. Non-deformability decreases with the increase of load; moreover, the reduction degree becomes bigger gradually. Compressive strength of SiC foam and volume fraction are nonlinearly dependable.