Abstract: Based on the four acid rain automatic stations rain data，statistical analysis of eight years to change characteristics of acid rain from 2008 to 2015，was discussed the changes of acid rain and carried out a preliminary analysis between the acid rain and the meteorological factors.The results showed that acid rain accounted for 0.66%，1.61%and 1.68%respectively in Lhasa，Xigaze and Naqu， but without no acid rain in Nyingchi station.The acid rain frequency was occurre d in July of Lhasa station， the acid rain and weak acid rain’s frequency were presented in the June， August and September of Xigaze station， and the acid rain and weak acid rain’s frequency were presented in the July-September and November of Naqu station.Precipitation intensity could affect the acidity of rain.The changes between the wind speed with the of the same in spring and autumn， and of the opposite in winter for three stations.The precipitation’s pH was increased with the air temperature has a decreasing trend in Lhasa and Xigaze stations.The atmospheric stability or not，there is no significant impact on the pH of local precipitation in this three stations.