Abstract: The basic effects of rotation have been surveyed in this paper.On the basis of theoretical analysis of three dimensional rotational incompressible boundary layer equations,the effects of centrifugal force,coriolis force and normal pressure gradients ( p/x 2 ≠0) due to rotation on the calculational results of these equations have been discussed in detail.The turbulent boundary layers on compressor rotor blades and on a rotating cylinder surface have been calculated as numerical examples.The results are consistent with the phenomena revealed in experiments.As a conclusion,the authors proposed that the coriolis force and the centrifugal force should be considered in the engineering computations of rotational problems and the normal pressure gradients are of great importance also in this case.