Abstract: By using several techniques of synthetic analysis, we studied the relation between the precursory anomaly and regional level of seismic activity in Xinjiang region. Based on the research of single item measurement, we concluded the characteristics of the middle-short-term precursory anomaly, especially the short-term and the sign of phase evolution, and then we analyzed 2 typical earthquake examples. So we consider that the short-term precursory anomaly of moderately strong earthquakes in Xinjiang region has a clear sign of phase, the techniques of synthetic analysis can offer the evidence for mid-long-term forecast, and the quasi-synchronous turning of many items is the main index of it. The concentrative appearance of many anomalies may be the phase sign of short-term anomaly, moreover, a widely sudden appearance of anomaly that has not background perhaps indicates the sign of the strong teleseism, and the anomaly intensity of deformation (AF value) can offer the information that where the earthquake will occur.

Key words: Precursor of earthquake, Characteristics of anomaly of single item measurement, Synthetical index of anomaly, Typical earthquake example item