Abstract: In order to study the basic parameters of dragline stripping technology in nearly horizontal open-pit coal mine, based on the basic parameters and its calculation formula of dragline, the annual effective production capacity of dragline was deduced, according to the basic situation of Heidaigou Open-pit Mine, the stripping parameters were studied and evaluated, and the results show that the annual effective production capacity of dragline accords with quadratic function relation between rotation angle, and the rotation angle has function relationship with stripping width and the effective mining time.