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In order to integrate chemical process operation system effectively, a web service based system information integration approach is presented in this paper. The application technologies of web service are introduced for chemical process information integration. Besides, the reality steps of information integration are introduced according to the proposed approach functions. Compared to the traditional distributed integration technology, the advances and features of the approach are discussed. A case study of a mini chemical operation platform is used to verify the practicability and validity of proposed information integration approach.