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Laguerre-Gauasian beams,as a special model with spiral phase structure,have been intensively investigated.Holographic grating method is a convenient method of generating Laguerre-Gaussian beams and measuring their orbitalangular momenta.But due to some inevitable adverse factors such as lateral displacement,angular deflection and elliptical incident profile of incident beam,the practical effectiveness should be reevaluated.This paper is devoted to the study on the influences of the abovementioned three adverse factors on the holographic grating method.The characteristics of the mode decomposition of diffractive order and the relative powers of the orbital angular momentumeigen-states are also given.