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中文摘要：
以双曲正切函数展开法、Jacobi椭圆函数展开法和试探函数法为基础,给出指数函数展开法,借助符号计算系统Mathematica,构造了一般格子方程和（2＋1）维Toda格子方程等非线性差分微分方程新的精确解,其中包括精确孤立波解.该方法在构造非线性差分微分方程精确解领域具有普遍意义.
英文摘要：
Based on hyperbolic tanh function expansion method,Jacobi elliptic function expansion method and trial function method,an exponential function expansion method is presented and applied to construct new exact solutions of the general lattice,（2＋1）-dimensional Tode lattice equation and other nonlinear difference differential equations with the help of symbolic computation system Mathematica.The solutions include exact solitary wave solutions.The method is of significance to seek exact solutions of other nonlinear difference differential equations.
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