Abstract: In this paper,the characteristics of canopy structure,such as the numbers of seedling,panicle and grain,the distribution of dry matters in different canopy layers and different organs,and the distributions of LAIand of solar radiation in different canopy layers of super high yielding community of japonica hybrid rice were studied,in comparison with normal japonica rice. The results showed that the total the dry matter weight and the dry matter weight of layers below 40 cm,40～60 cm,60～80 cm and above 80 cm of japonica hybrid rice canopy were 32.29 %,29.12%,13.95%,16.45% and 100.17% higher those that of normal japonica rice,respectively. The ratios of dry leaf (photosynthetic organ) and of dry panicle (sink organ) weight to total dry weight were 24.8% and 12.8%,respectively,which were greater than those of normal japonica rice,while the ratios of dry sheath and stem (storage organs) weight were 33.6% and 28.9%, respectively,which were lower than those of normal japonica rice. The allotment of LAIin different layers of japonica hybrid rice canopy was reasonable,and the LAIof above 40 cm layer at full heading stage reached 5.44. The solar radiation was well distributed inside japonica hybrid rice canopy,for example,the solar radiation in layers below 60 cm were 13.1%～37.0% higher,but 5.9%～12.2% lower above 60 cm than that of normal japonica rice. The extinction coefficients of solar radiation in layers below 20 cm,20～40 cm,40～60 cm and 60～80 cm of japonica hybrid rice canopy were 35.1 %,13.5%,29.1% and 17.2% lower than that of normal japonica rice,respectively.

Key words: Japonica hybrid rice, Super high yield, Canopy structure