Agricultural technology efficiency is one of the most important sources of agricultural growth.Based on potato production data from Dingxi city of Gansu province,this paper uses stochastic frontier production model in translog form to analyze the technical efficiency and its influencing factors.The result shows that impact of planting area on large scale land is bigger than that on small-scale land,the labor-intensive production of potato has more limitation in large-scale land than that in small-scale land.Among the input factors,the effect of labor time on the planting area will enlarge with the increase of planting area when reaching a certain extent,the quantity of fertilizer use begins to exert positive influence only when it reaches a minimum size.In addition,the soil quality,gender and the square of age have important impact on technical efficiency,while education and planting experience have no significant effect.Therefore,this paper puts forward to three suggestions on how to improve the efficiency of potato planting.First,choosing appropriate scale of planting land according to technology level and resources; second,farmers should increase the investment in animal power,labor time and chemical fertilizer for large scale lands to improve their efficiency; finally,soil quality of plots should be improved and training of farmers’ planting skills should also be strengthened.