Abstract: Considering the requirement of measurement for video probe, a method for measuring points, lines and surfaces of object by using line-structured laser was presented. The line-structured light imaging model was built, where the linear laser was used as an auxiliary light source irradiating on the surface of the object. Compared to the object image, the proportional coefficient was calibrated with multiplying factor in different distances and laser line positions. The geometry parameters were calculated based on the measurement platform. The experimental results show that the measuring error is less than 10%, which indicates the method can satify the requirements of the video probe.