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A geological model is usually constructed using geophysical and petrophysical data by virtue of geological information. In this work, in order to achieving accurate model we built a carbonate reservoir model not only by seismic and well log data but also by the integration of 99 well test data available for this field. Many features such as sealing faults, aquifer, fracturing and layering systems were observed during the well test interpretation. Some of the above features were identified only by pressure transient data such as one sealing fault in which it was not observed in the seismic data. In addition to the identification of structural features, permeability data from well test were also used for the construction of iso-permeability map instead of depending on permeability data from core analysis. This is very significant assignment in a heterogeneous carbonate reservoir and when a single porosity model is used. Permeability obtained from well test is the effective permeability in the drainage area of each well while permeability from core analysis does not represent the property of a heterogeneous reservoir. This work prove using transient pressure analysis results in construction of reservoir model improve accuracy of carbonate reservoirs models. Key words: carbonate reservoir, transient pressure, well test, reservoir model