Abstract: In this paper,a concept of multi rotor micro air vehicle（MAV）,which can motion to any direction even rolling on the ground,was presented.Three configurations of this vehicle were analyzed and the equations of motion were built.The vehicle has smaller sizes of shape,lighter weight and lower flight speed.As a result,Reynolds number of airfoil for this vehicle,based on rotor velocity,rotor chord length and flight mode of the vehicle,was varied from 1×10⁴ to 12.8×10⁴.A fairly conventional low Reynolds number airfoil section（Eppler 387） was chosen for the analysis.Aerodynamic characteristics of airfoil at low Reynolds number were investigated in order to better understand the behavior of airfoils in different flight regime using conformal hybrid meshes.The lift coefficient,drag coefficient and ratio of lift coefficient to drag coefficient at Reynolds number of 1×10⁴,2×10⁴,3×10⁴ and 6×10⁴,respectively,for a series of attack angle,were obtained,no study at Reynolds number less than 6×10⁴ before.The results of simulation were compared to the results of experiment and the agreement of trend of both is very well.