Based on th e theory and technology of seismic reservoir,the Permian volcanic reservoir in Wuxia area in northwestern margin ofJunggar Basin is researched．The result shows that the volcanic rock(lava tuff breccia)is resulted from the fissure volcanic eruption，the distribution is mainly controlled by the early crater and the paleogeomorphology before volcanic eruption，and the reservoir space is mainly air hole．By using the technology of the coherence analysis and the  paleogeomorphology recovery，the characteristics of the crater and paleogeomorphology before volcanic eruption are identified．The technology of logging and geophysics are applied to predict the favorable lithologies，the forecasting technique for fissure volcanic reservoir is formed and good results have been achieved．