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中文摘要：
利用反对称矩阵和罗德里格矩阵的性质，把传统的三个旋转角参数用反对称矩阵的三个独立元素代替，推导了用三个公共点计算任意旋转角情况下的7个参数的直接计算公式，井建立了相应的平差模型。
英文摘要：
In the 3D coordinate transformation, change of two datum system origins △X, △Y,△Z, scale change factor λ and three rotate angle θ,φ,ψ are generally used as parameters, a total of seven changes is called seven-parameter transformation. There are three transformation models, the Buras-Wolf model and the Molodensky model and the WTUSM model, generally used between two datum systems transformation. The linear models is used when the rotate angles are small; howev er, when the rotate angles are bigger, model errors will be produced relatively.
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