Based on the premise that the contact of the inside surface or the outside surface with the rollers is linear contact

the mathematical model of the inside and outside work surface with the conjugation theory of space curved surface.On this basis

the geometric characteristic of the inside and outside of the work surface is analyzed

established the three-dimensional geometry model of inside and outside work surface and the contact linear between roller is established and internal or external surface

and put forward the principle of the parameter design on the hyperboloid loader with rollers is proposed.