Abstract: From 2021 to 2022, the water level of Yingxiu Well showed a large annual decline and anomalous. In this paper, we analyze the correlation between rainfall and water level. A quantitative exclusion analysis was carried out to analyze the impact of rainfall on water level. The surrounding environment of the observation well was investigated. Geochemical tests were carried out on water samples. and carried out the analysis of stress changes in the wellbore aquifer system. Through the above methods, the abnormal causes of the annual change of water level in Yingxiu Well were analyzed. According to the analysis, the annual change of the water level in Yingxiujing in 2022 will drop significantly, which is not only controlled by rainfall factors, but also restricted by other factors. At the beginning of 2022, the parameters of the aquifer in the observation well fluctuated greatly, indicating that the annual gradient of water level was due to the tectonic static stress of the aquifer. It may be related to changes or adjustments in regional tectonic stresses before and after a series of magnitude 6 earthquakes from June to September 2022.