The paper studies coseismic effect of the great earthquake and teleseismic recorded by the Yongchun well water level. The ability of recording earthquake of the Yongchun well water level is improved before and after September 2007.This phenomenon is probably caused by earthquake intensity and frequency of Fujian Province. This paper also elaborates the characteristics of coseismic effect of this well water level: the maximum amplitude coseismic effect of this well water is directly proportional to magnitude and is inversely proportional to the epicentral distance overall. The ability of recording earthquakes of the same well has certain direct.