Abstract: Based on the meteorological observation data in thirteen meteorological stations from 1978 to 2008 in the Western Guizhou,the main meteorological restricting factors which influenced potato production and their effects to the development of potato farming were analyzed.It was found that the potato yield would reduce significantly when the total precipitation amount of March and April was less than 55 mm or more than 140 mm,the frequency of potato yield reducing occurrence 75%.When the total precipitation amount from May to July was less than 500 mm or more than 800 mm,88.9% of reducing frequency occurred.When sunshine hours in June was less than 80 hours or when the precipitation amount was less than 150 mm or more than 350mm,the frequency of potato yield reducing occurrence both 100%.

Key words: Potato production, Meteorological restricting factor, Suitable rainfall, Western Guizhou