中文摘要：

利用同伦分析法求解了Burgers方程，得到了其扭结形孤立波的近似解析解，该解非常接近于相应的精确解．结果表明，同伦分析法可用来求解非线性演化方程的孤立波解．同时，也对所用方法进行了一定扩展，得到了Kadomtsev-Petviashvili（KP）方程的钟形孤立子解．经过扩展后的方法能够更方便地用于求解更多非线性演化方程的高精度近似解析解．

英文摘要：

We solved the Burgers equation by using the homotopy analysis method （HAM） and obtained its approximate kink solitary wave solutions. The solutions agree very well with the exact solutions. The results indicate that the HAM is valid for finding the solitary wave solutions of a class of nonlinear evolution equations. We also made some efforts to extend the HAM. As an example, we got the bell-like solitary wave solutions of KP equation by this approach. Our extended method can be used to find the approximate solitary wave solutions for more nonlinear evolution equations in an easy way.