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The nature of the model that produced Enso-like oscillation is further discussed. There are some independent parameters in almost all simple models. The nature of the models can change markedly with these parameters, but it is usually not possible to determine parameter values accurately. In this paper we give a method to determine the parameters to some degree by using the monthly historical Comprehensive Ocean-Atmosphere Data Set (COADS). These parameters make the solutions of the model oscillate on interannual time scale.