The light scanning measurement systems with the single-line and coded (phase shifted) grating structure is widely used in the reverse engineering of complicated curves. But the ambiguity problem of measuring and the fairness problem could not be solved in a same time. The scanning measurement scheme with binocular vision and cross-line structured light was used in this work. It could improve the ambiguity problem of measuring, and the fairness of the reverse engineering was improved. As for the problem of multi-result of cross-line structured light matching under the epipolar constraint, an additional light planar constraint was proposed to delete the mismatched points effectively. The experimental results showed that the cross-line structured light matching method had good accuracy and laid a solid foundation of the space triangulation.