Through theory analysis, it was proved that single point subdomain integration is the general form of traditional finit difference. Finit difference integration schemes are only high order approximate of the integration scheme mentioned in this paper.

• 理论分析表明，单点子域积分法是传统差分法的一般形式，差分法积分格式只是本文积分格式的高阶近似的特殊形式。