Abstract: For understanding the effects of air temperature and precipitation indifferent growth stages of rice on its production, the observation data of rice growth period, yield and its formative factors in Hongta, Yuxi agricultural meteorological stations from 1980-2011 were used for analyzing the relationship between days of growth stages, yield and its formative factors of rice and air temperature and precipitation, respectively. The results showed that, precipitation was significantly positive related to days of growth stages excluding booting-heading stage. And tiller-booting stage and transplant-tiller stage were the most inhibited by precipitation (the correlation coefficient r=0.6362 and r=0.4247, respectively). Average temperature, maximum temperature and minimum temperature in tiller-booting stage and daily temperature range in tiller-booting stage and milk-maturity stage were significantly negative correlated to corresponding growth days. Seed per ear was the main formative factor that affect rice yield. It was positive correlated to air temperature in booting-milk maturity stage. Setting percentage was significantly negative correlated to maximum temperature and daily temperature range in milk-maturity stage, but it was significantly positive correlated to minimum temperature and precipitation. Thousand seed weight (TSW) was negative correlated to temperature in booting-maturity. Rice yield was significantly negative correlated to maximum temperature and daily temperature range in transplant-tiller stage but significantly positive correlated to precipitation, and the three meteorological factors in bumper harvest year were different from common year and poor year. The results indicated that, rice production in transplant-booting stage was mainly inhibited by precipitation. While in booting-maturity stage, it was mainly affected by temperature. Higher temperature promotes the increase of seed per ear, and greater daily temperature range promotes matter accumulation. Both of that are good for increasing rice yield.