The utilization of waveform to create seismic facies is to use the neural network technique to quantitatively describe the general variation of seismic signal or, more simply, to arrange the waveform into categories. The authors used the technique to carry out recognition and classification of various waveform features of seismic traces so as to reflect geological features of the study area. The map illustrating the seismic facies of the area was also drawn. According to available data from the area, the littoral deposition system was identified, in which each lithologic feature, sedimentary structure and vertical sequence were analyzed in detail. Furthermore, the seismic facies was transferred into the sedimentary facies according to the real conditions of the area. The planar distribution of the sedimentary facies of Devonian is described based on a comprehensive interpretation of Tahe area.