Abstract: The experiment with super hybrid rice (LiangYou 293 and ZhunLiangYou 527) was conducted in Changsha city (28°13′N) in 2004 and in 2005. 3 different fertilizer treatments of low rate (N 135kg/hm2+P 29.7kg/hm2+K 112.1kg/hm2), middle rate (N 180kg/hm2+ P 39.6kg/hm2+ K 149.4kg/hm2) and high rate (N 225kg/hm2+P 49.5kg/hm2+K 186.8kg/hm2) were experimented to study on the characteristics of the yield formation and the growth and physiology in super hybrid rice. The results show that there were significant differences of the yield and the yield components of panicle number, spikelets number per panicle, grain filling percentage and 1000 grain weigh between two years but not among the fertilizer treatments. The highest yield was harvested in the middle fertilizer rate treatment for both combinations, of which, in average, LiangYou 293 yielded 9.03t/hm2 and ZhunLiangYou 527 yielded 7.28t/hm2. The results also showed that proper nitrogen fertilizer rate was 150~180kg /hm2 for both LiangYou 293 and ZhunLiangYou 527. Compared with ZhunLiangYou 527, LiangYou 293 performed as early development, stronger tillering and rooting ability, low productive tiller percentage, high dry matter production in the early and mid-growth periods. ZhunLiangYou 527 had the high yielding performance with stable growth and high tiller productive percentage in the early and mid-growth periods and high photosynthesis productivity and translocation properties in the late growth periods.