At present,the data of the supervisory management system of electrical technology is dealt by hand,the information is slowly transferred,a great deal of data is required to be dealt with and the information can't be made for retrieving and sharing.With the development of computer and internet(or intranet),it is possible to update the method of the supervisory management system of electrical technology via internet(or intranet).This paper introduces the general design and techniques to complete the supervisory management of electrical technology based on B/S mode.This system adopts ASP.NET technology of Microsoft Inc. and Web DataWindow of Sun Inc. and achieved information quickly transferred,report tables collection and calculation,various query and report tables unified management.This paper also puts forward a method which adopts Web DataWindow technique of PowerBuilder7.0 to solve the problem,which is the data input and output as Freeform format?