Abstract:Existing common-used fractured models are three types when studying effect of parallel fracture or oriented fracture on seismic wave propagation;①fracture model having a small,isolate sliding surface or cracks with plane distribution;②fracture model having non--continuous contacting cracks with plane distribution;③fracture model putting plane interface as a continuous thin layer consisting of viscous liquid or soft material.Starting directly from more common theory,we deduced analytic expressions of coefficients of softness in fractured material.The effective fractured coefficients of softness and stiffness of three above-mentioned models has been calculated by using these analytic expressions and it has been proved that three above-mentioned models can be integrated into results of the paper.Char studying results show hat macroscopically measured coefficients of softness can be directly connected with microscopic structural feature of fracture when information on surface of f racture has been known.