Abstract: This paper studies the effects of three different forms of seedling raising trays (air-pruning tray, none air-pruning tray and regular tray) and thinly populated planting on rice seedling growth and physiological characteristics as well as yield. The research results show that the quality of air-pruned rice seedling is better than that produced by the other two forms of trays. The characteristics of rice from air-pruned seedling under reasonbly thinly populated planting condition are strong stem, high ratio of offshoot, delayed offshoot period, high grain raising and high yield.