Abstract:The observed data of 363 wells belong to China water level net for earthquake monitoring are collected and analyzed one by one. 9 parameters determinated by the day average value fitting,NAKAI fitting and monthly tidal factor are used to quantify the observed data. On the basis of these results, the general standard parameters of the observation of these water wells are given. The five levels (A, B, C, D, and E) are defined according to the statistic results. The estimation results for each well are also calculated. The results could be referred by construction of well water level and the users of the data.