Based on the daily rainfall data of 26 stations in 1961-2002 and the precipitation data of 10 stations in 1981-2001 in eastern Qinghai province, the climatic variation characteristics of rain day and rain intensity are analyzed. The result shows that the rain intensity is increasing with the decreasing of rain day and rainfall in summer season, the decreasing of rainfall in summer season is mainly associated with the decreasing of rain day, while the increasing of rainfall in winter season is due to the increasing of snow day and daily average rainfall. In recent 20 years, the maximum precipitation intensity in 10 minutes and an hour increases significantly. The frequency of heavy rainfall at nighttime in the 1990s is much more than that in the 1980s.