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利用SOFA软件包，消除了常见的天体测量效应，把星的理论位置转换到站心位置，并集中于后续的归算过程。详细介绍了心射投影和底片四常数求解的过程，并且通过了计算验证，该方法的测量精度在赤经和赤纬方向上约为0．05 mas （毫角秒）。“,”The SOFA Software Collection is used to remove the common measurement effect of astrometry ,transforming stars’ catalog posi-tions to observed positions .This paper focuses on central projection and a four -constant plate model solution .Based on the observation of NGC 2324 ,the precision at RA and Decl .is about 0 .05 mas .