Abstract:Because of equivalence of wave field,and the limitation and errors of surveyed data,the geophysical inversion has serious multi-solution and an important way reducing the multi-solution is to carry out constraint for the inversion process.The traditional first breaks travel-time tomographic imaging is usually to add apparent constraint to model space from outside and carry out slipping process,which can destroy the correlation between model parameters and propagation operator,and is difficult to reach the goal effectively using prior information,even affects the stability of inversion.In view of the difficulty,the paper divided the prior information into three categories and expounded how to add various kinds of prior information into inversion equations by normalized way on that basis,replacing traditional outside constrained mode.The theoretical tests showed the normalized approach can effectively improve the precision and resolution of inversion than that in outside constrained method; using normalized approach for 2-D practical data processing can also gain better inversion results.