Precipitation is an important factor in reflecting climatic characteristics. In this paper, Chinese ground climate data was used, 20 sites which represent the Qinghai-Tibetan Plateau area were selected and their precipitation days and precipitation data were recorded for analysis. Mann-Kendall test analysis method (MK-test) and wavelet analysis was used to analyze temporal and spatial features and evolution of precipitation days and precipitation on the Qinghai-Tibetan Plateau. The result shows that from 1980 to 2013, there was an opposite trend between the average annual precipitation changes in Qinghai-Tibetan Plateau and the precipitation days. While the average annual rainfall increased, the average annual precipitation days decrease at the same time. Wavelet analysis by the regional annual average precipitation days of the Qinghai-Tibetan Plateau revealed that the number of precipitation days from 1980 to 2013 exist fluctuation cycle changes of 8 years. From the wavelet analysis of the Qinghai-Tibetan Plateau we can see that 5 years and 11 years is the period of fluctuation in the average annual precipitation average annual rainfall wavelet. At the same time it can be found that precipitation increase from northwest to southeast and the days of precipitation and precipitation gradually increase, too. This regional distribution shows a same trend. The average annual precipitation days in Tibet is larger while compared to Qinghai, and the average annual rainfall is also greater than the average annual rainfall in Qinghai.