This paper describes how to design a man-machine intelligent game playing program ( tic-tac-toc) in LISP and to use successfully the method of heuristic search. This intelligent program has been developed on the IBM-PC/ XT computer. 本文叙述了在IBM-PC/XT个人计算机上,使用LISP语言研制的人机对奕一字棋程序中,如何成功地运用了启发式搜索法来设计该智能程序。