Taking spiral chute as example,a method of unfolded drawings and views about irregular spiral surface is introduced.The surface is undevelopable and too complicated to get its views or to draw unfolded drawings by manual method.In this article,a series of the boundary equations of the spiral chute are derived by the movement rule of coal flow,and the solid and views of the spiral chute are generated based on redevelopment of SolidWorks.Unfolded drawing is drawn applying triangular development principle.The views and unfolded drawings not only are produced automatically,precisely and parameterized,but also involve more technological information.So it has an important significance on the irregular spiral surface’s developments and processing. Taking spiral chute as example, a method of unfolded drawings and views on irregular spiral surface is introduced. The surface is undevelopable and too complicated to get its views or to draw unfolded drawings by manual method. In this article, a series of boundary equations of the spiral chute are derived by the movement rule of coal flow, and the solid and views of the spiral chute are based on redevelopment of solid works.Unfolded drawing is drawn applying triangular development principle. The views and unfolded drawings not only are produced automatically , precisely and parameterized, but also involve more technological information. So it has an important significance on the irregular spiral surface’s developments and processing.