Abstract：As density can be used to estimate fluid satu-ration, it plays an important role in reservoir pre-diction.However，it is difficult to estimate accu-rate parameters due to the ill-conditioned nature ofinverse problems and the band-limited nature ofseismic data.In order to stabilize inversion and im-prove the reliability and sparsity of inversion re-cult，we add regularization terms to the objectivefunction of probabilistic three-term AVO inversionto estimate P-wave，S-wave impedance and densi-ty.Although the regularization strategy is ap-plied，uncertainty in parameter estimation still ex-1t5. ThUS，we apply uncertainty analysis to deter-mine if the estimation is desirable.At last，the al-gorithm is tested on synthetic data and seismic da-to.Both results show that the method is feasible.
