Abstract: Yield formation characters of a hybrid rice variety under SRI (System of Rice Intensification) cultivation mode and its ecological factors show that in Nanjing the early sowing rice can not fully take advantage of more-tillers of SRI into full play due to the lower temperature;although the late sowing rice can meet the demand of temperature at tillering stage, heat in the late growth period is not sufficient,thus lowering the rate of seed set and 1000-grain weight.Analysis on the adaptability of SRI through meteorological data of Madagascar and the southern rice growing region of China suggests that the SRI cultivation method may be suitable for the coastal rice growing regions of Hainan,Guangdong,Guangxi provinces region and the lower altitude regions of the Yunnan-Guizhou Plateau.