In this paper,the anomalous characteristics of some seismic wave parameters before the Atushi M_S6.9 earthquake in Xinjiang on March 19,1996 have been analyzed.Some seismic wave parameters such as the first motion mark of seismic wave,amplitude ratio,attenuation coefficient of coda and duration ratio of coda showed anomaly in varying degree before this earthquake.There were also certain anomalies in spatial picture and time sequence curve of seismic activity. The writer made a short-impending term forecast for this earthquake based on above anomalies and three factors of prediction corresponded to the actual situation.The prediction thinking and method have been introduced and the anomaly mechanism is initialy analyzed also.