Abstract: Using the fixed position and intensive observation data during potato growth period (March to September) from 1978 to 2009,and the surface meteorological data (March to September) from 1960 to 2009 from 14 counties in western Guizhou province,authors analyzed the climatic factors variation,including temperature,precipitation and sunshine in western Guizhou province and their effect on potato growth by using the methods of climatic tendency,wavelet analysis,cubic function and the integral regression.The results showed that the inter annual temperature during potato growth period (March to September) increased significantly,with a climatic trend rate of 1.96℃/10y (P10℃ of 2100-3800℃〖KG-*4〗·〖KG-*4〗d,730-1300mm precipitation and 820-1100h sunshine hours during whole potato growth period.The temperature had negative effect to potato yield and the yield was sensitive to the temperature except for the tuber expansion period Precipitation was positive to potato yield except for florescence (middle May to late June),and it was sensitive to precipitation from florescence to tuber expansion period (middle May to late August).The sunshine was positive to potato yield and it was sensitive to sunshine in early florescence (late Mar.to middle May) and the tuber expansion period,except for seedling period (middle to late in May).

Key words: Climate change, Potato, Growth period, Effect, Western Guizhou province