The Criminal Procedure Law of China stipulates that the police and the procurator should co-operate with each other and that the procurator supervises the investigating activities by the police. However there exists contradiction between the "co- operation" and the "supervision".. if the co-operation between the police and the procurator is strengthened, the function of su- pervision to the investigative power will be weakened; if the supervision to the investigative power is strengthened, the co-oper- ation between the police and the procu...