At present，flexible employment becomes a new social connotation and practical significance，which plays an important role in promoting social stability and economic development. Based on a comprehensive review of domestic and foreign research results，it proposes a new definition of flexible employment from the practical exploration of government departments to encourage and regulate the development of flexible employment. The paper makes full use of big data resources and sample survey research results to study the characteristics of flexible employment groups，employment status，income level，social security，etc. Derived from the problems of low social security coverage，maintain rights and interests protection and effective supervision，policy suggestions are put forward to further accelerate the improvement of the system and mechanism construction in five areas，including policies and regulations，departmental collaboration，employment registration，employment services and dynamic monitoring，which provide reference for effectively protecting the legitimate rights and interests of flexible employment personnel.