| Inversion question is a kernel question of physical geography. Inversion's theories and methods have made great progress as electronic computers have widely applies in the field of prove of physical geography.There are many theories and methods of inversion to solve nonlinear inverse problems. These theories and methods have made a lot of achievements in practice. However, the conformation of the underground substances are various . So many factors which influence the explanation results are in existence. If some factors can't be properly dealt with in the process of explanation , amount of work will be added and what's more important is that the explanation results are not so good . According to the basic principle of proofread coefficient's potential field downward extrapolation ,mis article starts with characteristic analysis of proofread coefficient. It analyses proofread coefficient's effect to the result of downward extrapolation and use mixed optimization arithmetic to get optimization initial value and corresponding proofread coefficient value. Then the explanation results can make better reflection of source body's characters. |