随着改等开放的日益深入，新一轮“民工潮”正在形成。与之相伴随的外来人口作案也呈增多趋势。从浙江省舟山市的斗争实际出发，外来人口与本地人比，其作案手段、类型、时间、财物处置等方面有不同的特点，同时表现出侦查该类案件时的许多难点。因此，要侦防外来人口作案，必须对症下药，超常规思维，整体联动作战。 With the deepening of reform and opening up, a new round of “migrant workers tide” is taking shape. Accompanied by the foreign population crime also showed an increasing trend. According to the reality of the struggle in Zhoushan, Zhejiang Province, there are many differences between the migrant population and the locals in terms of their means of crime, the type, the time and the disposal of property, etc., and many difficulties in the investigation of such cases. Therefore, if we want to prevent the foreign population from committing the crime, we must prescribe the right remedy, unconventional thinking and overall linkage operations.