Laser remelting of thin plate, made of 5Cr4Mo3SiMnVAl(012Al) die steel and Cr12MoV die steel with thickness of 0 3 mm to 0 8 mm, was carried out by the use of pulsed Nd:YAG laser. The effects of technical parameters such as pulsed width and pulsed frequency, materials and materials thickness on the deformation characteristics of thin plate were studied. The results show that the deformation of thin plate die steel during pulsed Nd:YAG laser remelting is quite serious and the value is the same as the amount of materials thickness, and the maximum deformation value of thin plate in the thickness direction increases with the increase of pulsed width or the decrease of pulsed frequency or the decrease of materials thickness, and the maximum deformation value of thin plate in the thickness direction of Cr12MoV die steel is bigger than that of 012Al die steel. The main reasons are the differences of laser remelting technical parameters, the dissipated heat case of materials and the thermophysical properties of materials and the thermophysical properties of materials.