 The study analyses spatial and temporal variations in annual and intranual precipitation at 33 stations in the Three River Headwaters region from 1967 to 2016 using empirical orthogonal function and wavelet transform coherence methods. Results show that mean annual precipitation and mean dry period precipitation increased over time with a spatial southeast to northwest decreasing trend in annual and intranual precipitation. Two main precipitation patterns were observed. A dominant pattern with high and low value centers located in southeast and northwest TRH respectively and a dipole pattern with more precipitation over southwest TRH and less precipitation over northeast TRH. Precipitation changes were determined based on changes in weather systems affecting the area with different indices being correlated with different components during different times of the year. This article was authored by Yang Dong, Chie Chie, Yong Zhao, and others. We are article.tv, links in the description below.