主位是位于句首、作者或说话者选择的作为句子信息起点的成分。日语主位与英语主位在其特征、尤其是有/无标记这点上存在较大差异。无标记主位是基本语序的句首成分,有标记主位是非基本语序的句首成分。日语主位的推进模式与英语类似,错综复杂,本文分析了日语主位的四种推进模式。 The main position is at the beginning of the sentence, the author or the speaker selected as the starting point of the sentence information component. There is a big difference between the Japanese theme and the English theme in terms of their characteristics, especially the presence / absence of marks. The unmarked theme is the first sentence of the basic order of words, and the marked theme is the first sentence of the non-basic order of words. Thematic progression of Japanese is similar to that of English, which is complicated. This paper analyzes four modes of proposition of Japanese.