In order to solve the multi-valued problem caused by the calculation process,several effective ways were proposed for the theoretical analysis.

In this paper the onedimonsional Stefantype model for the heat effect of highirradiance laser on biotissues and the inverse problem identification are adopted to obtain a relational expression for calculating the ablation depth in laserirradiated tissues, in which the complex nature of actual situationthe multidimensional problemis taken into account.