The effect of mechanized cultivation on yield,growth duration and utilization of temperature and illumination of japonica high quality rice of Nanjing 9108 was investigated in different ecological regions under the rice-wheat cropping system to lay a theoretical basis for its large area mechanized transplanting and rational distribution. Under mechanized transplanting with blanket-shaped plantlet, we compared the yield,growth duration,utilization of temperature and illumination and green rice rate of Nanjing 9108 at variaus latitudes. The results showed that with increasing latitude the total accumulated temperature and yield first increased and then decreased, while the maturity followed a decrease trend.The whole growth duration increased with rising latitude at a rate of about 5 d for 1°. The total sunshine hours showed the same trend. The illumination has a great impact on the rice grain yield. With appropriate growth duration and high maturity, Central Jiangsu Province and Southern Jiangsu Province at northern latitudes from 32° to 34° are the most favorable planting areas, followed by Northern Jiangsu Province.