国共合作,是中国抗日民族统一战线的基础,也是抗日战争胜利的重要保证.抗日战争时期,美国从其全球战略出发,为了贯彻其对华政策,对国共两党的关系极为关注,并施加了影响.本文试就美国对国共关系制约的目的、措施和后果,谈一些粗浅看法,从国际制约因素这一角度探讨国共合作的发展轨迹和规律. During the period of the Anti-Japanese War, starting from its global strategy, the United States paid great attention to the relations between the KMT and the CPC in order to carry out its policy towards China and imposed a great deal of cooperation between the Kuomintists and the Chinese Communists on the basis of the anti-Japanese national united front. This article attempts to discuss the purposes, measures and consequences of the United States’ restraint on the relations between the KMT and the CPC, and discusses some superficial views on the development trajectories and laws of the Kuomintang and Communist cooperation from the perspective of international constraints.