A three-dimesional (3-D) finite element model for the numerical simulation of laser transformation hardening on the plate and inner wall of revolving body is established by means of a finite element code-Sysweld, in which the change of thermal mechanical parameters with temperature is considered and the 3-D Gaussian heat source is adopted. The temperature field, martensite distribution and residual stress field are predicted. The influence of workpiece shape on the temperature and residual stress are studied. The results show that the thermal cycles of different points on the surface direction are similar for the two model while the peak temperature of different points of inner wall model in the section direction are higher than that of the plate model. After treatment martensite can be obtained as a main phase in the hardened zone with an about phase volume fraction of 90%. The tensile stress appears in the boundary of hardening zone and heat affected zone (HAZ) and the compressive stress exists in the hardening zone. Comparing with revolving body, the value of the compressive residual stress in the center of the surface of plate is higher.