Public security licence ; legal action of administrative ; restrainable mechanism of before the event ; managerial pattern .

公安许可；行政法律行为；事前控制机制；公安管理模式。

Public security licence is a mechanism of before the event for preventing danger and a restrainable inter vencing means on society that has powerful level and higher cost .

公安许可是公安机关为了防止危险而实施的一种事前控制机制，属于对社会干预程度较强的、成本较高的抑制性规制手段。