In order to study the relationships between accumulation. distribution of dry matter and grain yield of rice two kinds of different yield level experimental fields 7 500 kg/hm² and 9 500 kg/hm² were designed, and the results showed: total dry matters accumulation were obviously different among different yield levels, there were significant positive correlations between yield and dry matter accumula-tion; In the period of rice growth phase, the photosynthate mainly supplied to growing centre at that time, that is to say:at primary growing stage, the photosynthate supplied to the vegetative organs, in the middle of growing stage, it transfered to reproductive organs and up to organs of the later stage; there were significant difference of N content rate of each organ among different yields, the more yield was, the more N content rate of organ.