///Void Space Description (VSD) is a new method for quantitative recognition and prediction of faulted-related fractures targeting tight reservoir in gentle area. In this paper, this method is applied to the study on fault-related fracture systems occurred in the Lianglitage Formation in Tazhong X well area, Tarim Basin. During this course, taking Tazhong A well as an example, it is pointed out the calculation of VSD mainly include qualitative recognition of fault-related fracture by using fault plane detachment void space theory and quantitative calculation using VSD software, and the latter is composed of structure modeling, stratigraphic modeling, calibration of fracture porosity and VSD calculation. The results of VSD on seismic profiles crossing three wells in the study area are proved available with cores, logging and well drilling data.