Abstract: Seven crustal deformation anomalies before some earthquakes are analyzed in this paper.Through analysis five basic shape characters are summed up,which are: (1)suddenly change in the early stage; (2)anomalies usually recover before the occurrence of an earthquake and the quake usually does not occur during the sudden change period; (3)the quake occurrence time is usually at about one month after the anomalies recovered; (4)magnitude of the earthquake has no obvious corresponding with the extent of the anomalies quantitatively; (5)the effective radius of the anomaly is about 200 kilometers.Based on the analysis,we further discussed the physical mechanism for the shape characters of the anomalies.