Abstract: The purpose of the experiment is solving the practical problem of potato planting. We have investigated the potato overground and underground yield of different fertilizer rates, have measured total N, total P and total K of the potato overground and underground on different fertilizer rates, have analyzed the effect of different fertilizer rates on the yield of potato and the characteristics of the accumulation about dry matter and nutrition, have compared the harvest index and the needed fertilizer per 1000kg yield. Result,The fertilizer rate of 937.5kg/hm2 could get the highest yield. It increased 17.8 percent of yield than ck. Its accumulation of dry matter, N and P is also the highest, but the harvest index of N, P and K is smaller than of 750kg/hm2 and 1125kg/hm2. Indicated that the treatment produced more carbonhydrate. More fertilizers could not produced more yield if fertilizing too much. The fertilizer of 750-1125 kg/hm2.