CFCC prepared by chemical vapor infiltration (CVI) has the difficulty in quality control. It is very important to study the quality of the material, and it has important significance for the material usage and performance characterization. In this paper, the density uniformity and quality of CFCC are evaluated by ultrasonic method. According to the serious attenuation, the penetration method is used to measure the acoustic parameters:sound velocity and attenuation,and nonlinear parameter evaluation material uniformity,and compared the test by the metallographic method.The results show that,attenuation and nonlinear parameter can accurately evaluate material uniformity,the sound velocity is the most mature uniformity characterization methods among them.