We analyze the water temperature changes in the Yushu well,and found that four of five abnormal changes show a certain relevance with the earthquakes in the Qinghai-Tibetan block. We conclude the results as follows:with the decrease of the distance between the epicenter and the observation well,the amplitude of the water temperature in observation well increases;the bigger the earthquake is,the shorter the time interval between the occurrence of changes and earthquakes is. The results show that,the typical changes in the Yushu well are earthquake precursors,which also have a good monitoring significance of the earthquakes in the Qinghai-Tibetan block.