Abstract:An empirical "Model V", simply called"synthetic decision model"was developed on the basis of the "synthetic judgement model with generalized fuzzy operation" in the practice of predicting herbage yield. This model is written as :The model not only had obvious advantage of being calculated simply and being popularized easily but broadened the scope of application of the"synthetic judgement model with generalized fuzzy operation". In order to make up some deficiency, statistics was used for developing the fol...