Abstract: Along with the application of computer for fiber dosage,a sharp increase is seen of the fiber dosage data in the database.In order to find out significant information from the database for control of fiber sorting on lot-to-lot basis,this paper firstly probes the database design method,analyzes the relationship between tables and entity property of tables in detail,and discusses the general description of the regulation for fiber dosage,and then puts forward a kind of "window scanning" algorithm which can automatically find out the regulation from the database according to its description.Moreover,application examples are given,which show that the algorithm of "window scanning" is simple and easy to operate,and has practical value in automatically creating tables which control fiber sorting and blending on lot-to-lot basis in a computer system.