Abstract: By exposing to three structural factors，street-level bureaucrats obtain three strategies during the law enforcement，namely，positive law-enforcement，passive law-enforcement，and law-enforcement shirking. During the routinized law enforcement process，considering the rules clarity and public accountability，street-level bureaucrats would value both reciprocity norms and self-interest and conduct positive law-enforcement behaviors. If the law-enforcement process is under strict control from higher-ups，street-level bureaucrats would apply several strategies such as rule dependence，peer collusion，and blame avoidance，eventually choose to passive law-enforcement. When the high-ups intensify the control and the demand for public accountability，street-level bureaucrats would have limited leeway to use their discretion in the design of implementation. By evaluating the complication of working tasks and goals，street-level bureaucrats will choose the strategies of law-enforcement shirking. The analysis to the three types of strategies in law enforcement is helpful to understand the behaviors of street-level bureaucrats and provide suggestions for standardizing frontline law-enforcement management.

Key words: street-level bureaucrat, law enforcement, strategic law-enforcement