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Six kinds of interpolation methods,including projection-shape function method,three-dimensional linear interpolation method,optimal interpolation method,constant volume transformation method and so on,were adoped in the study of interpolation accuracy.From the point of view about the characterization of matching condition of two different grids and interpolation function,the infuencing factor on the interpolation accuracy was studied.This paper also involved NASA (National Aeronautics and Space Administration)Rotor67 as an example.