[en] The skeleton assembly platform is the key equipment for the manufacture of nuclear fuel assembly. At present, there is no calibration method related to the skeleton assembly platform at home or abroad. In order to ensure the accurate positioning of the frame and the dimension of the skeleton quality, the calibration method of the skeleton assembly platform is carried out. Calibration methods include calibration items, calibration required standard instruments, calibration methods and feasibility analysis of straightness instead of flatness and so on. After the calibration method is determined, the calibration experiment is carried out according to the calibration method. The calibration results are in accordance with the technical requirements, the evaluation uncertainty is also made to prove the calibration method is workable, and it can be extended to assembly platform, pull rods platform and expansion platform, etc. (authors)