It is great that the influence of laser beam intensity distribution and its shape on laser hardened layer performance. Rectangle facula or wide-band facula are applied widely. But laser beam of uniform intensity distribution can not always generate uniform hardened layer. At present, using general laser heat treatment beam optimum equipment, the distribution shape of laser hardened layer was crescent. Based on the analysis of research on beam optimum system for laser heat treatment in the world, two different methods on laser beam optimum are present in order to improve distribution uniformity of hardened layer. Laser scanning ring facula and linear facula are analyzed in the new methods. The mathematic models of laser beam optimum are built and their temperature field distributions are simulated. The distribution uniformity of the hardened layer is improved.