Flocking system is one of the hotspots in the research of multi-agent systemand it is of great theoretical and practical significance to study its fission behavior.This paper summarizes the composition of flocking systeminformation interaction mechanism and stability analysis of fission.Firstlythe composition of flocking system is classified and introduced from the perspective of heterogeneous and isomorphic agentthe effects and limitations of fission methods based on isomorphic and heterogeneous flocking systems are discussed.Secondlythe information interaction of fixed neighbor distance and selective information interaction are summarized and analyzedand the shortcomings and application occasions of each information interaction mechanism are pointed out.Finallythe existing theoretical analysis methods of fission stability are introduced and analyzedthe future research direction of fission behavior is indicated.