In order to research the characteristics and sources of acid rain in the source region of the Yangtze River.This paper collected 402 precipitation samples from January 1, 2010 to December 31, 2015.From the analysis of pH value, electrical conductivity (EC), precipitation and wind speed of precipitation samples in the source region of the Yangtze River, especially for the analysis of the 14 acid rain events.And applied the HYSPLIT model to study the source of acid rain in the source area of the Yangtze River.The results show that:(1) Acid rain event occurred in the source region of the Yangtze river, and the precipitation of pH value less than 6.5 accounted for 61.69% of the total precipitation, the precipitation of pH value between 6.5 and 7.0 accounted for 37.56%, the precipitation of pH value was over 7 accounted for 0.75%.The source region of the Yangtze River had been seriously affected by the pollution sources from the surrounding area; (2) During the period of sampling, the variation range of pH value was 4.0~8.57, with the mean value 6.37.And the range of EC was 5.2~124.4 μs·cm-1, the average was 27.59 μs·cm-1.The order of pH in four seasons was summer > spring = winter > autumn, the value was 6.41, 6.37, 6.37 and 6.25, respectively.And the order of conductivity in the four seasons was spring > winter > summer > autumn, with the value was 37.62, 31.86, 25.75 and 24.04 μs·cm-1, respectively.(3) The source area of the Yangtze River was affected by the southwest monsoon from January 1, 2010 to December 31, 2015, which had occurred 5 times, accounted for 35.71% of the total number of acid rain events.And the occurrence of acid rain events affected by the westerly circulation has been up to 64.29% of the total number of times.So acid rain in the source region of the Yangtze River was mainly affected by the southwest monsoon and the westerly circulation.On the one hand, the occurrence of acid rain mainly controlled by industrial pollution and other pollutants coming from India, Nepal and other countries.On the other hand, because of the Qinghai Tibetan highway and the Qinghai Tibetan railway, there were a lot of cars coming and going.And the people in the summer to plateau tourism increased year by year, and more for self-driving travelling.This added additional pollutants (automobile exhaust) for the source of the Yangtze River.
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