Abstract: The analytic formula of the technological parameters for the slight-stretch reducing mill is deduced.And the design concept and method of the software procedure of the said process is described.Then using Visual Basic 6.0 as the development language code,a software for the design is made,resulting in the computerizel design of the technological parameter,thus providing the steel pipe equipment makers with a high efficient and reliable design system for pass design,stretch setting,automation control procedure parameter setting and so on.