According to the seepage observation data of piezometric tube in Guanghua reservoir from 2013 to 2019,the variation law of piezometric tube water level and reservoir water level hydrograph is analyzed.Combined with the correlation analysis of piezometric tube water level and reservoir water level,the seepage situation in the process of dam operation is evaluated,and the existing problems in dam operation are found out.It has a certain reference value for the analysis of dam safety monitoring data and reservoir operation management．