Based on the synthetic math expression of earthquake precursory anomaly information variable in this paper,we acquired the S-values according to the information with precursory anomaly provided by 11 seismic stations and non-precursory anomaly by 7 seismic stations before Xiuyan 5.

Based on the mechanism to induce groundwater anomaly,the interferences of precursory anomaly and its recognition are discussed,and the view of "rain and groundwater interference"is questioned.

Before the two events,a lot of precursory anomalies of subsurface fluid appeared in north Tianshan mountations area,but there is clearly difference in the anomalies before the two events.

Discussion on precursory abnormity of water chymistry mechanism in Wutazui spring;

There appeared orderly precursory abnormity of underground fluid in the northern Tienshan mountain before the earthquake,and most of them is mid-short term abnormity,concentrating on around Urumqi,which is 265 km or so from the epicenter.