The present invention relates to a CAD collaboration design systemMemorize CAD files by timelineCreate different timeFixUpdated version conveniently restoredCan be checked andBy storing a CAD file with summary files and incremental databasesAs the amount of data transmission is reducedGuaranteed accuracy when restoring filesImprove the overall CAD system management efficiency.The present invention also provides a new reference method to allow the CAD drawing engineer to conveniently filter the contents of the referenced file, as well as to share the referenced rule file with other collaboration design sides And, the stratification display method avoids many problems caused by the nest relation in the external external reference, and improves the smoothness in the external file reference.Finally, the present invention realizes the synchronization of the editing and the check of the reference contents change by duplicating and overlapping the reference contents (filters or selectively exhibiting) in the CAD file which is being edited, and it is expected that the design and the efficiency of the collaboration design work be further improved.
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