(3+1)维Kadomtsev- Petviashvili方程新的精确解

High stability and particle properties of solitons have aroused great interest in solitary, and are frequently found in the fluid physics, solid state physics, plasma physics and optical experiment. Many nonlinear evolution equations have soliton solution, so a lot of solving methods, such as: the inverse scattering method, Darboux transformation method, B?cklund transformation method, the hyperbolic function method. Combined with the homogeneous balance method and G'/G method, we discusses the new exact solutions of the (3+1)dimensional Kadomtsev- Petviashvili equations.