Grid generation is one of the key problems in CFD and the numerical grid geriera-tion technique using PDE is widely used and frequently studied. In the paper the non-linearfactors in grid generation equation (PDE) are well studied, the theoretical and numerical resultsshowing that the factors have influences on the grid spacing and orthogonality, i.e. the factor can be used to control the grid orthogonality, factor or can be used to control the gridspacing, and the strength and functions of spacing controlling are directly connected with theratio of to