In the information age,diversified public interests need to be protected urgently,and administrative tasks are increasing.Due to the disadvantages in terms of staffing and technology,public security organs are forced to seek private co-operation,and to fulfill administrative tasks in various ways through"police-enterprise co-operation".When private subjects perform functions traditionally regarded as belonging exclusively to the state,it will inevitably bring unprecedented challenges to the traditional administrative organizational law,which upholds the concept of"law-governed administration",and whether the"functionalist"theory,which takes administrative tasks as the point of intervention,will be able to break through by the traditional"normativist"theory.Whether the"functionalist"theory of administrative tasks can break out of the institutional dilemma brought about by the traditional"normative"theory of administrative law to"police enterprise cooperation",the premise is to prove the legitimacy of the private subjects to undertake administrative tasks,and as a premise to build"police-enterprise co-operation".The premise is to prove the legitimacy of administrative tasks undertaken by private subjects,and to construct the organizational method of"police-enterprise cooperation"on this premise.