In order to solve the knowledge extraction problem in fuzzy system and avoid the starting value choice haphazardness. A dynamic fuzzy neural network(D-FNN),algorithm is proposed. When the criterion of rule generation is used,the output error and the effective radius of the may-hold boundary are considered,as two important factors. By using the graduation study strategy's application,the study validity is greatly enhanced. In addition the parameter adjustment is only restricted in the linear parameter,withou...