中文摘要：

研究了一类非单调线搜索修正DY法，在适当的条件下，对一般非凸函数，证明了在新给出的非单调线搜索下修正的DY共轭梯度方法的全局收敛性，数值结果表明了该算法的有效性。

英文摘要：

We researched a modified DY method with nonmonotone line searches. Under proper conditions, we proved the global convergence of modified DY conjugate gradient method with the nonmonotone line searches for nonconvex functions. And according to the numerical results, the algorithm is effective.