Abstract: In the process of blast furnace bell-less top charging,it is difficult for operators to directly observe the burden surface profile and burden trajectory.Based on the principle of optics,a polar coordinate laser grid measurement technology is proposed to measure the burden surface and burden trajectory.Dual CCD stereoscopic vision calibration with high precision is introduced to create the detailed computer images of the burden trajectory with a boundary operator,acquire information about the burden trajectory in charging,and reconstruct the process of blast furnace bell-less top charging.