大位移井井眼轨迹的自动控制十分重要，为此国内外都在研究各种井下自动可控的导向工具，可控偏心稳定器就是其中之一。在国内有关理论的基础上，对带可控偏心稳定器的下部钻具组合的力学特性进行了研究。结果表明，当偏心稳定器伸缩块的伸出量随意可控时，钻头上的造斜力随偏心距的增加而增加，随偏心稳定器安装位置的上移而减小，方位力则相反。造斜力随偏心方位角的变化规律近似为半正弦函数，而方位力的变化规律则近似为正弦函数。 It is very important to control the trajectory of well with large displacement well automatically. Therefore, all kinds of directional control tools are researched at home and abroad. Controllable eccentric stabilizer is one of them. Based on the domestic theory, the mechanical characteristics of the lower hole assembly with controllable eccentric stabilizer were studied. The results show that when the extension of the eccentric stabilizer is controlled freely, the force on the bit increases with the increase of eccentricity and decreases with the upward movement of the eccentric stabilizer, and the azimuthal force is opposite. The change law of the oblique force with eccentricity azimuth is approximate to the half sine function, while the change law of the azimuth force is approximate to the sine function.