Abstract: In order to gain the best climate index for potatos planting,provide the best meteorological service,and reduce the affection of disadvantageous weather conditions on potatos production,it chooses some data of the potatos yield in Weining and from 1986~2009 meteorological data including precipitation,sunlight time and tempreture from weining meteorological station.By using the statistical analysis methods such as integral regression analysis,relationship analysis and nonlinear analysis,it researches the dynamic effect of meteorological condition such as sunlight,tempreture and precipitation during the potato growing stage on potato yield,the conclutions are following :the tempreture has negative impact on potato yields,the thermal resource is very abundant in Weining county,and there is lack of high tempreture day the sunlight resource is also very good to potato,the trend of sunshine hours meet the potato growing demands for light;the abundant precipitation is conductive to increase the potato yields.