Abstract: The paper Based on the 1959 to 2008 data of precipitation in Huhhot,used Precipitation anomaly percentage and linear analysis methods to analyze trends in drought Hohhot, found that the following characteristics：（1） precipitation variability rate is high,drought frequency as high as 44.3%,periodic droughts occur every year. month, season, years of drought frequency in the central urban area and Tuzuoqi is higher than other regions. （2） Winter is the highest frequency of droughts in the season, Spring is in the second.（3） Inter-annual variation in drought, Intensity of the mid-60s before the drought, the largest,since the mid-90s urban areas,Tuzuoqi ,Wuchuan ,and Helin county frequent fluctuations in rainfall, there is a continuous emergence of dry years,but its strength weaker than the 60＇s.