Abstract: The paper has analysed the tensile fissure of SiC/7075A1 P/M composite materials and longitudinal structure in the area around the fissure by using SEM. Dynamic in situ observation for the fracture process of the materials has been put forward fracture mould of SiC/7075A1 composite materials have been established with the purpose of disclosure of the fracture behavior of SiC/7075A1 composite materials.