In this paper,based on the experimental data of rock mechanics,the matrix modulus and consolidation coefficient of rock in the Shanxi reservoir area were obtained by the method of combined Biot-Gassmann equation and Pride model. Then the P wave velocity and the wave velocity ratio were obtained by solving the combined seismic wave travel time equation group method and the multi station method. Finally,we calculated the rhyolite porphyry saturation and porosity,and analyzed the changes of rock saturation and porosity. The results are as follows:(1)The rock saturation were greater than 99%,and the greatest was 100%,that is to say,the earthquake rocks are always in water saturation or near saturation. Wave velocity and wave speed ratio change is mainly caused by the change of porosity.(2)The rhyolite porphyry porosity of the upper limit is 6.6%~15.5%,and the lower limit value of 3.6%~4.2%. The lower limit values are close to the porosity measured by the laboratory before the earthquake. If the hyolite porphyry porosity laboratory measurement is the initial value,rock porosity during the earthquake increases by 3.2%~12.09%.(3)In 2008,after the earthquake epicentral area rock porosity gradually closed,until August 2014 porosity began increases rapidly. From September 15 on,a new set of seismic activities occurred again in primary seismic zone,and rock porosity showed an increase before this group of seismic activity.