Abstract: This paper compared the difference of some photosynthetic characters and yields in various colony densities of 3 sugarcane cultivars.The results revealed that the mass photosynthetic area,chlorophyll content and dry weight sbowed a significantly positive correlation with colony density and yield.The mass photosynthetic characters and yields of 2-bud seedlings of Fuzhe 8710 at the densities of 3500 and 4000 seedlings/Mu were significantly higher than those of other treatments.The capacities of tillering and population self-regulation of Fuzhe 8710 and Fuzhe 8715 was much stronger than that of M.T.70-611,the appropriate cultural practices are recommended in commercial production.