Through numerical simulation and experimental study on transverse feed Grind-hardening of 45 steel,the paper analyzes the surface hardening effects with different areas of workpiece. The results indicate that under the experiment condition,the top value of hardness and hardened depth is 728. 4 HV and 1.1mm,which achieves the surface hardening requirements,but there are differences among cut-in area,middle area and cut-out area. And low-temperature tempering was occurred in the overlap region after surface h...