Abstract： In this paper by investigating，collecting and identifing Subfamily Agrostidoideae (Gramineae) inHangzhou district .there are 157 taxa of Agrostidoideae. Among these taxa there are 136 species，20 va-rieties and 1 form which belong to 81 genera and 12 tribs. Species component and distribuion on patternof Agrostidoideae in this district analysed in the unit of trib，genus and species，the results are summa-rized as follows: (1) The quantities of the genus and species among tribs are great disparity, which relate to tonalityand geographic distribution of tribs. (2) The floristic diversity is revealed by the main component of monotypic and oligotypic genera. (3) None of endemic genera and species reflect that the topography of the distribution area is rela-tively unitary. (4)Distribution diversity represents a transition at pattern of distribution from tropical to temper-ate. (5)The floristic elements are complex and mainly composed of wide distribution of China，widedistribution to the south of the Yangtze River and the distribution of East China.