In our country，the decision of criminal detention is mainly carried out by the public security organizations, but criminal detention ,as a more stringent measure, has such shortcomings as the lack of procedural safeguards, too simple power configuration, extended custody and so on which result in the requirement to change the decision subject of criminal detention. The foreign judicial writ system in which the judge is the main body should't be completely introduced into our country to of the judicial writ system, but on the basis of this together with the situation of our country, prosecutor can carry out the criminal detention. The system will be analyzed through the neutrality of prosecutors, the function of legal supervision, the public trust in the judiciary and the efficiency of litigation