Abstract: The paper aims to understand the climatic change characteristics of precipitation during the critical growth period of edible rape in central Tibet, thus to provide a key reference for scientific irrigation. The authors analyzed the characteristics and changing trends of precipitation during the critical period of water requirement of edible rape with statistics methods, such as arithmetic mean and liner trend analysis, based on a homogeneity-adjusted precipitation data of 9 weather stations in central Tibet from 1981 to 2014. The results showed that the precipitation exhibited a significant variability both temporally and spatially during grey moss and flowering period of edible rape in central Tibet, and the precipitation of most years could not fully satisfy the water requirements of edible rape, indicating a lack of water. In particular, during the past 34 years, the precipitation during grey moss period of rape showed a significant increasing trend with a rate from 0.5 to 8.6 mm/10 a in all stations except Gyantse station, which showed a decreasing trend. The apparent increase in precipitation during flowering stage and whole growth period of rape was found to be at a rate of 2.9-10.9 mm/10 a and 3.9-32.4 mm/10 a, respectively. Overall, the increase in precipitation could mitigate water deficiency in central Tibet, and facilitate the growth and development for edible rape.