Abstract: For knowledge innovation in information systems integration project, all parties need to invest resouree and share cost expenditvre, while uncertainty exists in business experience, integration experience, knowledge sharing, and project management, etc. Therefore it is uncertain for such kind of project to be success, and suppliers of existed systems would not like to participate in integration planning and system modifying for this reason. They might boycott the cost sharing for knowledge innovation. From the view of knowledge accumulation, the knowledge innovation model and cost model are built, and some new mechanism for knowledge innovation cost sharing is put forward that suppliers’cost sharing would be helpful for better anticipation and effort, and the sharing proportion is influenced by learning capability of both suppliers and enterprises, and by the anticipation of uncertainty and knowledge innovation efficiency.

Key words: uncertainty, cost sharing, knowledge innovation, information system integration