The measurement data about section characteristic and the crown meter only serve the current process in hot continuous mill unit production processes,and can not be applied in quality objection analysis and guidance of parameters optimization of production process in the down-stream product,which results in low data utilization ratio.In order to solve this problem,the ordinary four-roll hot continuous mill unit was taken as the object,fully considering the hot continuous mill unit equipment and process characteristics.Making use of relevant function of crown meter and data acquisition system,a set of reappearance and analysis technology of section characteristics for hot continuous mill unit has been put forward.The corresponding reappearance and analysis system of section characteristics was developed,and was applied to a certain 2050 hot continuous mill unit,which has achieved good results.Not only was the different moment of rolling strip thickness distribution dynamic reappearance,but also the 3D distribution of the section characteristics of the whole volume strip and the distribution characteristic of the crown and the wedge are given.This technology effectively improved the quality of the hot rolling process of the product and reduced the quality complaints from the down-stream user and created the larger economic benefits.