Abstract: Jizhangshu No.8 is the main cultivated fresh food potato （Solanum tuberosum L.） variety for a seasonin the northern , and it is popular with potato farmers because of its high yield and stress resistance. But its growth period is long, the plant is thick green when harvest, potato navel is crisp and tender, making it often cause pathogen infection, cause stock rotten potato to be serious. In order to improve the storage resistance of Jizhangshu No.8 and increase its economic benefit, the effects of mechanical seedling killing and three concentrations of Lishougu seeding killing agent on the yield and storage resistance of Jizhangshu No.8 were studied in the Bashang area of Zhangjiakou city in Hebei peovince without seedling killing as the control. The results showed that low concentration （3.0 g/L） Lishougu seeding killing agent had the best economic benefit and increased 1 409 yuan（RMB）/hm², field yield of this treatment was 40 530 kg/hm²,0.7% less than that of control （40 800 kg/hm²）; The rate of rotten potato was 2.5%, which was significantly lower than that of control （4.7%）, and the weight of good potato out of storage was 39 517 kg/hm², which increased 1.6% compared with that of control （38 882 kg/hm²）;the starch content was 13.99%, decreased by 1.00 percent, and dry matter content was 19.45%, decreased by 1.31 percent.

Key words: potato（Solanum tuberosum L.）, Jizhangshu No.8, mechanical seedling killing, Lishougu seeding killing, yield, storage resistance