The system of criminal evidence is the core and basis of the system of criminal procedure, and it is the requirement of judicial justice. It is stipulated that all the facts that can prove the truth of the case are proofs and seven specific manifestations of evidence whose competency of evidence is not limited in general are enumerated in Article 42 of the criminal procedure law of China. As a result, the adversary system has not been well implemented in the procedure since the criminal procedure law was revised,which has caused many problems in practice,especially in terms of standard of proof and rules of evidence.The author plans to discuss it from the two aspects in sequence.