The performance analysis of CMCAM detector in clutter edges is carried out. Under Swerling Ⅱ assumption, the analytic expression of the peak of false alarm rate at clutter edges is derived, and compared with that of OS CFAR detector. The analytic results show that the ability of CMCAM to control the rise of false alarm is more effective than that of OS. The peak of false alarm rate of CMCAM 1-2 order of magnitude lower than that of OS with ,and the peak of false alarm rate of CMCAM is also less than that of OS with .With the results proposed by \[7\], the analytic results show that the detection performance of CMCAM is superior to that of OS in both homogeneous background and in non-homogeneous backgrounds. Because the automatic censoring technique is adopted in CMCAM detector, the anti-jamming capability is increased, and the parameter can be selected freely. In CMCAM detector the mean value of CM and CA local estimations is taken as the noise power estimation, so the sample sorting time of CMCAM is only half of that of OS. In a word, it is a easily realized CFAR scheme.