Abstract: In Mine Surveying, through measurement it is an extremely important element, it is important to mine production whether the two Face position can transfixed in the design 。The method of Conventional error estimation only considers the error through an important direction, but it does not consider the vertical direction through error. In some large projects，it not only needs to consider penetrating through error important direction, but also the direction perpendicular to it through error s, then we need to consider the size of the position error through points. In this paper, a large Buddhist temple coal mine, making the error is expected when using condition adjustment model to study the conditions under the principle of least squares to meet, how to make the penetration point through points of error to a minimum, and is expected through error through points。