The present invention converts the structural model of the AM system by providing a file format that can be used in another CAD system for the structural model of the CAD system for ship design, and converts the file format to confirm the structural model reflecting attribute information in the SM system. It''s about how to convert. To this end, the present invention includes the steps of: a) extracting the SDNF file of the model to be converted from the AM file, b) extracting the CIS/2 file from the SDNF file extracted in step a), and c) the b) Reflecting the attribute information to the CIS/2 file extracted in step d) importing the CIS/2 file reflecting the layer information into the SM system.
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