Combing neural networks and fuzzy system, this project studies smoothing algorithm and steepest descent algorithm for training fuzzy neural networks to improve the learning efficiency of fuzzy neural networks, and analyzes convergence and stability for the algorithms to ensure the feasibility of them, and thus to provide some new ideas and theoretical bases for the applications and studies of fuzzy systems and neural networks, and furhter to promote the development of cross-disciplinary. The specific research topics include: (1) Using smoothding method to approximate the Input/Output relations...