Abstract: The inversion of sandstone porosity based on seismic data is discussed. The basic principles are that 1) seismic data and logging data are used to inverse the wave impedance of sand set, 2) the wave impedance of the sand set is corrected to remove the effect of mudstone, and 3) the wave impedance after correction (the wave impedance of sandstone) is used to calculate the porosity. The method was applied to Dongpu depression, showing that the predicted porosity and its distribution feature on plane is in good accord with the logging data.