In this paper,authors studied the relationship between seismicity anomalous changes of fault product gases at 4 measuring points along the northeastern margin of Qinghai-Tibet plate.The anomalies of fault product gas components appeared at these measuring points from 1992 to 1993,for example,sudden change and rising of the observed values.The anomalies of various components or/and at various measuring points have obvious synchronism.Authors mainly introduce the anomalies of fault gases observed at many measuring points before the Tuolai M 6.0 earthquake occurring on Oct.26,1993.At last,the field effect of fault product gases is discussed preliminarily.