话题和主语问题是现代汉语语法研究的热点，也是难点之一。介绍几种比较有影响的关于话题和主语的观点，然后主要分析了三个平面埋论和话题句法观关于话题和主语区分中的一些问题，指出话题是一多位性概念，它在语用和句法上都形成自己的特征。不能局限于某个层面来研究话题，应该从多方面、多角度来研究，这样才能得出科学的结论。 Topic and subject are the hot points of modern Chinese grammar research, but also one of the difficulties. Introduce several influential views on topic and subject, and then analyze some of the problems of topic and topic distinction in three aspects of planar inference and topic syntax. It points out that topic is a multi-concept, And syntactically form their own characteristics. Can not be limited to a certain level to study the topic, it should be from a multi-faceted, multi-angle study, in order to draw scientific conclusions.