Abstract: By employing function one direction S-rough sets，the generation method and correlative concepts of f-model and f-t order one direction dynamic model of R-function equivalence class[u（x）]，and the generation method and the correlative concepts of F-model and F-one direction dynamic model are proposed；then the order relation theorem and the dynamic separation theorem of F-one direction dynamic model are presented.The dynamic characteristic of F-model depends on the attribute cancellation to the attribute set α.The generation principle of F-model and its application are given on the basis of the researches above.

Key words: dual of function one direction S-rough sets, f-model, F-model, F-model theorem, one direction dynamic characteristic

摘要： 利用函数单向S-粗集对偶，给出R-函数等价类[u（x）]的f-模型与f-t阶单向动态模型的生成及有关概念，给出F-模型与F-单向动态模型生成及有关概念，提出F-单向动态模型序关系定理及动态分离定理，F-模型的动态特征依赖于属性集α上的属性删除。利用这些讨论，给出F-模型生成原理及应用。

关键词: 函数单向S-粗集对偶, f-模型, F-模型, F-模型定理, 单向动态特征