With discussion of the importance of grid generation techniques for fluid fieldscalculation, an non- periodicity grid generation method is presented in this paper. It is univer-sal for the grid spacing and the grid generation of arbitrary geometrical shape and theorthogonality can be controlled easily and conveniently. In addition, the relationship betweenorthogonality and spacing and the influencial factors for orthogonality are discussed. The corre-sponding improving skill is suggested as well.