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IT service performance tuning aims to meliorate the resource allocation for multi IT applications hierarchized by business logic, grounded on the cooperative enterprise intranet environment which is distributed and heterogeneous, in order to get the best business support levels and gain maximum profit with resources constraints. After analyzing the two factors that have impact on the application service, the authors emphasize in this paper the establishment of performance tuning model which optimizes the resources allocating policy, based on goal programming method. And then an example is given to validate the availability of the model. Finally further issues about the existing problems and future improvement about the model are discussed.