Interactive feature definition as XML is useful method for improving the interaction of the algorithm and system. We combine Feature Definition Language ( FDL ) and fuzzy theory to present the Fuzzy-based Feature Definition Language FFDL. 类XML交互式特征定义是提高算法和系统交互性的有效方法,本文结合特征定义语言和模糊逻辑,提出了基于模糊逻辑的特征定义语言FFDL,实现了有效实用的数据交互分析手段。