Abstract：Exemplified by the volcanic reservoir of 1st Member of Yingcheng Formation in Xudong area of Songliao Basin, the authors studied the characteristics of flow unit spatial-temporal development in the aim strata of the study area. In this process, all work was based on the isochronous framework of stratrigraphy. Two parameters were selected and the software of SPSS was used. In addition, cluster analysis and discriminant analysis were carried out. The results indicate that porosity and permeability are two parameters which can well represent the reservoir characteristics. The flow unit in the study area can be classified into four types, i.e., Type I, II, III and IV, in which Type III and Type IV are well developed, Type II possesses the second place, and Type I is poorly developed. Closely combining the well data and seismic data in the isochronous framework of stratrigraphy and using the software of SPSS to perform cluster analysis and discriminant analysis prove to be a very efficient way for flow unit study. It can provide substantial foundation for the exploitation of the volcanic reservoir.