The finite difference method was used to calculate the thermal field induced by laser beam with different power repartitions on the surface of cylindrical body with different radius. It shows that the induced thermal field is related to the laser repartition as well as radius of cylinders. It is important to note that there is a critical radium for a cylinder to be self-quenched by a laser beam. Otherwise, the assisted cooling will be inevitable. For the tubes, the same scene happens when a critical radium and thickness is reached. The experiments were performed to verify the validity of the modelling. Comparison between experiments and theoretical calculation confirms the validity of the finite difference calculations. It is evident that the absorption at the surface is also an important factor in the laser heat treatment. Therefore the appropriate method of modelling as well as the stable absorption is the key to predict the laser induced thermal effects.