To solve the performance changes of an icing aircraft wing, a new test method of aerodynamic characteristics and structural characteristics is proposed based on flow field and structure field coupled analysis. Firstly, the method is used to discretely analyze time-averaged N-S equation of two-dimensional steady incompressible viscous flow with finite element methods, droplet trajectory equation is solved with 4-order ronggo-kuta method to determine the degree of pollution. Secondly, coupled analysis of flow field and structure field is carried out, and comparison with unpolluted wing’s aerodynamic characteristics and structural characteristics is used to determine whether icing wing performance is failure. Practical similar experiment shows that the method can be applied to evaluate performance of the icing wing.