The paper analyzes the upper and lower sight error computation method of large inclined angle vertical image,estimates relative orien-tation precision through simulation image. As far as conventional image being concerned,the image point precision of building vertical model optimizes 1/6 pixel,as far as large inclined angle image being concerned,the average image point precision of building vertical model is about 1/3 pixel.%分析了大倾角影像立体像对上下视差的计算方法，并通过仿真影像估计了影像相对定向的精度，对常规影像，构建立体模型的像点精度优于1／6像素，对大倾角影像，构建立体模型的平均像点精度约为1／3像素。
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