Segments are widely used in tunnel construction, especially large diameter cross river or sea tunnels. In shield construction, the quality of segment plays an important role in the safety, quality and appearance of the whole formed tunnel. The mold may be deformed during production and later use. If it cannot be adjusted in time, quality problems will occur in the produced segments, which will further affect the quality of the later assembled tunnels. Based on this, WEDO has specially rolled out a set of 3D measurement solutions for segments and molds, and has become the domestic supplier who can independently provide measurement solutions for such products.