In the closure of the super-large modules of large offshore platforms, aiming at the problems of measurement difficulty and high risk existing in the total station measurement method, the 3D laser scanning technology is used to complete the measurement of the closure mouth and realize the precision control of the closure of the super-large modules. The application of 3D laser scanning technology can not only solve the problems existing in total station measurement, but also verify the reliability of 3D laser scanning technology in ship industry.