There are many flaws in current criterion of proof for arrest.The criterion of proof for arrest can be considered for the following improvements.The crime under the Penal Code is divided into arrestable offence and general crime.Arrestable offence of standard proof is "reasonably belief ",which means that there are sufficient evidences for people to believe that the suspects should be arrested.The criterion of proof for general crime is "crime being real",and it means that the crimes should be punishable by prison sentence and should be arrested more than necessary.