Abstract:This paper measures the bee pollination externality effect on factor output elasticity and contribution rate of oilseed rape yield and analyzes the regional disparity between plain and mountainous area of this effect,using a trans-log production function model and 2890 observations from 1069 rapeseed farmers.The unbalanced panel data was collected from 15 provinces (regions) by China Agriculture Research System(Rapeseed) farmer fixed observation point from 2016 to 2019.The result showed that:1) Beekeeper’s pollination had a positive significant effect on the annual rapeseed yields,whose output elasticity was 0.136 at the mean value.It was second only to the land(0.861),higher than that of labor(-0.009),fertilizer(0.043) and other production inputs(0.076),contributing 2.885% of the growth of rapeseed yields during the period.2) The contribution rate of each factor to the increase of the annual yield of rape farmers varied greatly,in descending order of land,other production inputs,fertilizer,beekeeper’s pollination and labor.3) The effect of Beekeeper’s pollination on the annual rapeseed yields varied greatly from region to region,with a higher output elasticity and contribution rate in plain county.It is suggested the government increase the subsidies for beekeepers,strengthen the publicity of the knowledge of beekeeper’s pollination,promote the cooperation between planting industry and beekeeping industry in the future.