毛泽东将社会矛盾问题分为两类：敌我矛盾和人民内部矛盾。敌我矛盾是对抗性矛盾，是无法调和的，例如阶级和阶级之间的矛盾；人民内部矛盾则是非对抗性的。

1. ↑ http://www.people.com.cn/BIG5/shizheng/8198/30446/30451/2210841.html

Antagonistic contradiction (Chinese language: 矛盾; Pinyin: Máo dùn) is the impossibility of compromise between different social classes. The term is most often applied in Maoist theory, which holds that differences between the two primary classes, the working class/proletariat and the bourgeoisie are so great that there is no way to bring about a reconciliation of their views. Because the groups involved have diametrically opposed concerns, their objectives are so dissimilar and contradictory that no mutually acceptable resolution can be found. Nonantagonistic contradictions may be resolved through mere debate, but antagonistic contradictions can only be resolved through struggle.