The common Vondrak smoothing filtering method,used in astronomy data handling,was adopt-ed here to deal with the two groups of fixed point horizontal and vertical crust deformation data by means of high-pass,low-pass and band-pass digital filterings,respectively.The results showed that after handling the data,the abnormal informations of crustal deformation for different periods prior to the shocks were obviously and the effects of background noise and observing error were reduced as well.It also indicated that the method is of a better capability for recognized the abnormal of pre-earthquake deformation.