Abstract: To avoid the dependence of hadron structure functions upon supposed function forms and to improve the accuracy, a new method to find the hadron structure fundtion at high Q² is discussed in this paper to replace the commonly used moment method. The sturcture functions for gluon and valence quark and sea at high Q² are obtained by discretizing the A-P evolution equations into ordinary simultaneous differential eqs. and then solving them with Runge-Kutta method.

Key words: hadron structure function, A-P eqs, Runge-Kutta method, numerical solution