Abstract: To provide scientific evidence for efficient production and cultivation of potato and promote the rapid development of potato industry, different topdressing treatments in field were conducted, which were T1 (CK, 0 kg/hm2), T2 (600 kg/hm2), T3 (750 kg/hm2) and T4 (900 kg/hm2), to explore their effect on potato yield, commercial rate, the accumulation and absorption efficiency of trace elements at growth stage under drip irrigation. The results showed that: (1) the yield and commercial rate of potato could be efficiently improved by topdressing in the late stage, compared with T1 treatment, the yield of T2, T3 and T4 treatment increased by 9.24% , 27.18% and 16.60% respectively, while the commercial rate increased by 14.73% , 23.52% and 18.44% , respectively, and the yield and commercial rate of potato were remarkably different among all treatments, the optimum fertilization was base fertilizer 2250 kg/hm2, topdressing 750 kg/hm2, and the yield reached 38835 kg/hm2; (2) the accumulation of trace elements was significantly increased by late stage topdressing, compared with T1 treatment, in the whole growth period, the average iron accumulation amount of T2, T3 and T4 increased by 22.74% , 46.39% and 35.81% , respectively, Mn accumulation increased by 16.40%, 29.89% and 25.70%, respectively, copper accumulation increased by 14.41%, 40.81% and 26.41%, respectively, and zinc accumulation increased by 12.84% , 25.92% and 19.34% , respectively; (3) the absorption rate of iron, manganese, copper and zinc were effectively increased by topdressing, compared with T1 treatment, in the whole growth period, the average iron absorption rate of T2, T3 and T4 increased by 22.97%, 45.95% and 32.43%, respectively, Mn absorption rate increased by 17.08%, 29.89% and 25.70%, respectively; copper absorption rate increased by 12.92% , 39.53% and 20.16% , respectively, and zinc absorption rate increased by 9.49%, 26.65% and 17.00%, respectively; (4) the maximum absorption rate of different trace elements appeared at different potato growth stages, among them, the maximum absorption rate of iron, copper and zinc appeared at the tuber enlargement stage, while the maximum absorption rate of manganese appeared at the tuber formation stage. Therefore, the best supplementary period of trace elements to potato should be during the tuber formation to the tuber enlargement stage.