在相关文献的基础上，提出无约束优化问题的修正WYL共轭梯度法，该方法不依赖于任何线搜索而满足充分下降性，证明了采用Arimijo型线搜索算法的全局收敛性，及在适当条件下算法具有R-线收敛速率，证明了采用重开始策略时算法具有n步二次收敛性。% Based on the relevant literatures, a new modified WYL conjugate gradient method for unconstrained optimization is proposed. The new method has sufficient descent property without any line search condition. Under Armijo-type line search, this paper shows that the new method possess⁃es global convergence and linear convergence rate. The new method is quadratic al y convergent with a restart strategy if the initial step length is appro⁃priate.
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