Laser remelting of thin plate, made of 5Cr4Mo3SiMnVAl(012Al) die steel and Cr12MoV die steel with thickness of 0.3mm to 2.0mm, 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 geometric characteristics of laser remelting zone were studied. One-dimensional (1D) analytical model was also used to calculate the depth of laser remelting. The results show that the width and depth of laser remelting zone increases with the increase of pulsed width or the decrease of pulsed frequency, and the width and depth of laser remelting zone of Cr12MoV die steel is bigger than that of 012Al die steel, and the width of laser remelting zone increases and the depth of laser remelting zone decreases with the increase of materials thickness, and the 1D model is useful for the calculation of laser remelting depth. The main reason is the differences of laser remelting technical parameters, the dissipated heat case of materials and the thermophysical properties of materials.