Abstract：In order to overcome the weaknesses of the large storage requirements and complex computation of other algorithms, and to improve the efficiency of algorithms for large-scale nonlinear equations, a new search direction formula was put forward based on the CD conjugate gradient method. Meanwhile, a CD conjugate gradient algorithm for nonlinear equations was modified based on the projection technique and the search approach. The new algorithm has following properties: ( 1) sufficient descent property without any line search; ( 2) features of a trust region; ( 3) the global convergence under the general assumption conditions. The new algirithmis more efficient than the normal CD conjugate gradient method.

Keyword：nonlinear equations;conjugate gradient method;projection approach;global convergence;