Abstract: Ultrasounic elasticity imaging is a promising method that may eventually allow early detection of many tissue pathologies and assess the biomechanical properties of soft tissue.A new method is put forward to detect the discontinuity of ultrasound backscattering signals by dyadic wavelet transform,to locate the regular scatterers,and then to obtain the internal strain and elasticity distribution of soft tissue.The transient point detection method is robust.Motionestimation using interscatterer spacing eliminates ultrasounic speckle decorrelation,computing complexity and accumulated errors.The strain and elasticity evaluation can distinguish the tissue with different Young's Modulus with high spatial resolution.Besides the elasticity of soft tissue,microstructure information is presented also.