The aerodynamic force of bionic wing has very important significance in the design of bionic flappingwing robot. Because the research of relevant microaerodynamics with low Renault number of flying by the microbionic flappingwing robot is still in its primary stage, there are no mature theory and experience of reference for the study of aerodynamic force of bionic wing. So a computational fluid dynamics software, named Fluent was employed to solve NS function, by which influence on aerodynamic performance of the bionic flappingwing robot caused by flapping mode and environmental airflow was analyzed. The results of this study show that bionic wing can get big lift force driven by symmetrical flapping wing mechanism, and the lift and drag forces are increased by increasing the flapping frequency and inlet flow velocity. However the drag force increasing range is relatively small, which provide theoretical basis for the research and manufacture of bionic flappingwing robot.