1　引言近年来模糊逻辑理论在非线性系统辨识领域中得到了广泛的应用 .模糊逻辑建模方法的主要内容可分为两个层次 ,一是模型结构的辨识 ,另一则是模型参数的估计 .模糊模型的结构辨识问题是指如何划分输入空间 .模糊树模型 (FT模型 )是一种利用二叉树结构描述输入空间模糊划分 1 Introduction In recent years, fuzzy logic theory has been widely used in the field of nonlinear system identification.The main contents of fuzzy logic modeling methods can be divided into two levels, one is the identification of model structure and the other is the estimation of model parameters Fuzzy structure model identification problem is how to divide the input space.Fuzzy tree model (FT model) is a binary tree structure to describe the input space fuzzy partition