In this paper,we solve some fifth-order nonlinear evolution equations by using modified F-expansion method,and obtain abundant new exact solutions.

By using a modified F-expansion method,rich families of exact solutions of DGH equation with strong dispersive term have been obtained,including soliton-like solutions,trigonometric function solutions and rational solutions.

In this paper, the major contents conclude: under Homogeneous balance idea, a modified F-expansion method is proposed by taking full advantages of F-expansion method and Riccati equation in seeking exact solutions of nonlinear PDEs.

The improved F-expansion method is proposed more recently and,by using the improved F- expansion method,many exact solutions for a class of nonlinear coupled Klein-Gordon equations are con- structed.

By utilizing the auxiliary ordinary differential equation and its solutions,the first kind and second kind of KdV equation with variable coefficients were investigated by means of the extended tanh-function method,and abundant new exact solitary wave solutions were obtained under certain conditions.

We give a new improved truncated expansion method.

Solving KdV equation with variable coefficients by using F-expansion method;

The extended F-expansion method and new exact solutions of the generalized KdV equation

The F-expansion method which can be used to solve nonlinear equations has been summarized.