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The Green printing has the followed three characteristics: the lower environment impact,the less pollution,saving resources and energy of the printing.Many printing produces are deserted in china every year.With the development of IT technology and communication technology,digital printing appeared.In fact,digital printing is a kind of green printing.However,high efficiency digital printing relied on knowledge management.The ontology technology is firstly introduced the printing plant utilizing digital printing.And this paper presented knowledge management model of green printing.