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以鄂尔多斯盆地延长组致密油藏为研究对象，运用油藏数值模拟方法研究了水平段方位、水平段长度、压裂参数等对水平井产能的影响规律。研究结果表明：考虑地质、工程及成本等因素，当水平段方向垂直于最大主应力方向，水平段长度为900～1800 m ，裂缝间距为60～120 m ，裂缝半长为70～110 m ，导流系数为25～100 D· cm时，压裂水平井开发效果较好。“,”We take the reservoirs of Yanchang oil layer in Ordos Basin as an example ,using the Eclipse ,a reservoir numerical simulation software ,to establish a model of single well productivity prediction of the fractured horizontal well and study the effect of the horizontal sec-tion parameters and the fracture parameters upon the productivity .The parameters are optimized to provide theoretical basis for the practical production .The results show that ,so far as the geology ,engineering and its cost are concerned ,when the horizontal section direction is perpendicular to the direction of maximum principal stress ,the development effect of horizontal wells is the best ;the production of single horizontal well and the length of horizontal section are roughly in linear relationship ,and the optimized length of the horizontal section is be-tween 900 m and 1 ,800 m;the optimized fracture spacing is 60-120 m ,the crack length is between 70-110 m and the perveance 25-100 D· cm .