In order to evaluate the effect of fiber direction deviation on the performance of composite propeller blades,a solid finite elements model was established based on the results of the draping simulation with Fibersim software.The FEM analysis results considering fiber direction deviation was compared with the results ignoring fiber direction deviation.The results show that the errors of natural frequencies and maximum deformation under uniformly distributed pressure are less than 5% while ignoring fiber direction deviation.But the maximum deformation under distributed temperature field of considering fiber direction deviation is about 2 times of that of ignoring it.Fiber direction deviations of the 0°,45°,and -45° plies exceed 25° in partial area of the blade.The FEM analysis of composite propeller blades should be based on the true fiber direction after draping.