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As the supporting infrastructure of company information business, accurate estimation of information system hardware resources has very important significances for construction, operation and expansion of information system. At present, the major method of measuring the hardware resource capacity of information system includes TPC, SPEC, SAP benchmark, Linpack, RPE2, etc.. Our research shows that these methods have certain generality, but in response to the actual performance index system and other aspects exist some deficiencies, leading enterprises generally lack of suitable capacity of the hardware resource assessment and allocation method in the process of the construction of information system, resulting in information construction cost increase or waste of resources.To solve this problem, through the performance test of the actual information system, based on the measured data, the analysis of the key parameters by fitting method and grey correlation method on the hardware resources of the system capacity, capacity building hardware resources evaluation and calculation model to quantify the measurement more accurate demand for resources and performance index.In this way, the modeling is obtained.The example shows that the model is correct and effective and it has a certain value in engineering.Using the method combined with the actual situation of enterprise information system, to establish the standard for the enterprise's own characteristics.Help enterprises to determine the selection of hardware procurement, reduce procurement costs:that is not wasted and can meet business needs.