Abstract Flapping-wing micro aerial vehicles mimic birds or insect flight principle,has the advantage of small volume,light weight,good stealth ability,etc.,is widely used in military and civil fields.Papilio is chosen to research the flapping wing flight and flight mechanism in this paper.The parametric language is used to constructed butterfly wing model to carry on motion analysis and the design of the flapping-wing mechanism. (1)Researched and analyzed the flapping wing flight and micro-morphology of the papilio,obtained its dimension parameter and motion parameter,provided data references for the numerical modeling and mechanical modeling of the bionic ornithopter. (2)The imitating butterfly fluid simulation mode is based on the parameterized modeling method on FLUENT software platform,to solve the flow field of the moving boundary this problem,using the dynamic mesh technique, research on hydrodynamic performance of airfoil.Fluid simulation results show: eddy current is the main cause of high lift;in the large span,the low frequency flutter premise,flapping amplitude is proportional to lift and thrust's generated. (3)Based on the analytical method design the plane four-bar linkage,using quick-return characteristics to design flapping-wing mechanism,and make motion analyses.Established the three-dimensional model of the flapping wing,and made motion simulation on solidworks software.The research results reveal that the flapping-wing mechanism motion analysis which is compared with three-dimensional model simulated analysis is feasible and reliable. Keyword:Flapping-wing micro aerial vehicles,fluid dynamics simulation, dynamic mesh,quick-return characteristics,motion simulationII Abstract Flapping-wing micro aerial vehicles mimic birds or insect flight principle, has the advantage of small volume, light weight, good stealth ability, etc., is widely used in military and civil fields. Papilio is chosen to research the flapping wing flight and flight mechanism in this paper. The parametric language is used to constructed butterfly wing model to carry on motion analysis and the design of the flapping-wing mechanism. (1) Researched and analyzed the flapping wing flight and micro-morphology of the papilio, obtained its dimension parameter and motion parameter, provided data references for the numerical modeling and mechanical modeling of the bionic ornithopter. (2)The imitating butterfly fluid simulation mode is based on the parameterized modeling method on FLUENT software platform, to solve the flow field of the moving boundary this problem, using the dynamic mesh technique, research on hydrodynamic performance of airfoil. Fluid simulation results show: eddy current is the main cause of high lift; in the large span, the low frequency flutter premise, flapping amplitude is proportional to lift and thrust, s generated. (3)Based on the analytical method design the plane four-bar linkage, using quick-return characteristics to design flapping-wing mechanism, and make motion analyses. Established the three-dimensional model of the flapping wing, and made motion simulation on solidworks software. The research results reveal that the flapping-wing mechanism motion analysis which is compared with three-dimensional model simulated analysis is feasible and reliable. Keyword: Flapping-wing micro aerial vehicles, fluid dynamics simulation, dynamic mesh, quick-return characteristics, motion simulation