Abstract: The Qinghai-Tibet Plateau has experienced significant warming and humidification under global warming. It is of great practical significance to understand the impact of warm, wet and warm-wet composite events on the ecological environment quality in this region. Selecting the data of 134 meteorological observation stations on the Qinghai-Tibet Plateau from 1961 to 2019, using the percentile threshold method and RSEI methods, the temporal and spatial changes of warm, wet, and warm-wet composite events and their correlation between ecological environment quality in the region were analyzed. The following conclusions were drawn: (1) The Qinghai-Tibet Plateau warm events from 1961 to 2019 generally experienced a trend of " up-down-up". Wet events and warm-wet composite events generally showed a significant upward trend. Warm events occurred more frequently in the south, wet events occurred more frequently in the east and south of study area. And warm-wet composite events occurred more frequently in the northeast. Warm events and warm-wet events displayed a decreasing trend in the southern part of the study area and an increasing trend in the northern part. Wet events displayed an overall increasing trend across the entire plateau. (2) The ecological environment quality of the Qinghai-Tibet Plateau was high in the southeast and low in the northwest. Significant improvement was seen in the north and west while the northwest had a degrading trend. (3) Warm events, wet events and warm-wet composite events were generally positively correlated with the ecological environment quality. The southern part exhibited a relatively obvious negative correlation, while the central and northern parts showed a significant positive correlation. (4) The correlation between different events and the quality of the ecological environment was significantly positive in the mid-altitude area (2500~4000 meters).