A comparatively uniform hardened layer affected mostly by dimensional intensity distribution is commonly pursued in laser hardening engineering. A semi-quantitative mathematic model is proposed for two-dimensional spot-array to get uniform hardened layers, in which a homogeneous temperature field is used to get the rates of intensity of every spot. The examples of inverse design of intensity distribution for 3×3 and 5×5 two-dimensional spot-arrays are given. The feasibility of the inverse design method is proved by numerical simulation based on finite element (FE) analysis and experiments. Results show that the uniformity of hardened layers is improved by the inverse method.