Applying zinc fertilizer on zinc deficient soil can not only improve potato yield，but also significantly improve potato tuber zinc content. The purpose of this study is to reveal the differences in the optimal spraying amount，spraying period and spraying type of zinc fertilizer on the leaves of different maturity and varieties of potatoes in improving potato yield and tuber zinc content. Three groups of experiments were conducted under field conditions from April 2020 to October 2021 with potato varieties feiruita，Atlantic and Dingshu No. 4 as test materials. In experiment 1，different types of zinc fertilizer spraying tests were conducted. There were 4 treatments:no zinc fertilizer control(G0)，spraying zinc sulfate aqueous solution(G1)，spraying zinc sulfate + urea aqueous solution(G2)and spraying ximelo sugar alcohol zinc aqueous solution (G3)；In experiment 2，different zinc fertilizer spraying rates were tested，with 6 treatments of spraying concentration of 0.00%(F0)，0.02%(F1)，0.03%(F2)，0.04%(F3)，0.05%(F4)and 0.06%(F5)；In experiment 3，spraying zinc fertilizer in different periods was conducted with five treatments:without spraying zinc fertilizer in growth period(L0)， spraying in seedling period(L1)，spraying in budding period(L2)，spraying in tuber formation period(L3)and spraying in tuber expansion period(L4). The results showed that the yield of potato，the content of zinc in tuber and the SPAD value of leaves were increased by spraying appropriate amount of zinc sulfate on the leaves. When the concentration of zinc fertilizer was 0.30%，the content of zinc in the tubers of early maturing cultivar Feiwuruita and middle maturing cultivar Atlantic significantly increased by 37.25% and 32.26%，respectively，compared with that of non-spraying treatment. When the concentration of zinc fertilizer was 0.50%，the tuber zinc content of late maturing variety Dingshu 4 increased significantly by 31.75%. The key period of spraying different varieties of potato was the tuber formation and expansion period，and the tuber zinc content increased by 46.26% on average compared with that without spraying treatment. Spraying zinc sulfate and urea solution on leaves increased yield and efficiency significantly，zinc content in tubers increased by 42.11%，and yield increased by 12.86%. To sum up，based on the analysis of the field application effect of foliar zinc application on increasing potato yield and tuber zinc content，0.30% zinc sulfate solution can be used on early and medium maturing potatoes，0.50% zinc sulfate solution can be applied on late maturing varieties，and 0.05% urea can be combined applied with foliar zinc sulfate solution according to local conditions at two key stages of potato tuber formation and tuber expansion，which can achieve the best fertilizer utilization efficiency，maximize and increase the yield，and improve the zinc nutrition content of potatoes.