According to Load/Unload response ratio(LURR) theory, the damage evolution of source media in the critical seismogenic region can be reflected by LURR values. In calculating LURR value, many physical parameters can be regarded as response, such as Benioff strain, modulus. In this paper, the different evolutions of LURR values using these different physical responses are investigated by experiments and theoretical methods. The results indicate that before the LURR values reach the peak value, the similar evolutions of LURR values are observed.