The invention discloses a difference control method of a
data model. The method comprises the following steps that (a), PDM (
physical data model) files of different version databases are obtained; (b) the
data structure of each basic element in the PDM files is extracted and is stored into a
database; (c) the data structures of all of the basic elements in the two PDM files are read from the
database for one-by-one difference comparison; (d) difference results of the two version databases corresponding to the two PDM files are displayed by adopting
visualization patterns and statistical data. The difference control method has the advantages that the
data structure of each basic element in the PDM files of different version databases is extracted, and the difference results of the two version
database are displayed through one-by-one comparison, pattern
visualization and data statistics, so the data models can be collected in a unified way, various data models can be fast and conveniently managed, in addition, the differences of different version data models can be accurately distinguished, and the effective difference control is realized.