In this paper,we introduced the anomalies of the tilt before the Wuqia earthquake (M=7.4,1985),the Atushi earthquake (M=5.4,1986) and the Wushi earthquake (M=6.4,1987).The anomalous duration is about two to nine months.The anomalous magnitudes are 8.5,6.5 and 7.5 angular-sencond respectively.Meanwhile,the probable reason that produced the anomaly is analysed.