Abstract：The structure secant method is applied to the quasi-Newton algorithms,and according to utilizing the gradient information and the function value of the objective function,the introduction of quasi-Newton equation and using Wolfe line search criteria,a new algorithm for unconstrained optimization problems is given. Furthermore,local and super-linear convergence of the algorithm is obtained under some reasonable conditions.

Keyword：unconstrained optimization;quasi-Newton equation;linear search;global convergence;