Abstract: Complicated clock infer-structure of modern SOC brings potential problems related with CDC signal interface operations.The root cause of metastability caused by CDC and the methods dealing with it are discussed in detail.A random delay injection based CDC verification method is presented to meet the verification challenge of CDC.This method converts metastability into sample data random jitter lasting for one clock period,which makes it feasible the RTL pre-simulation when physical clock tree information is not available.The result of an example shows the method is suitable to do CDC verification for SOC designs.