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发展了一套孪函数多电子基向Ｓｌａｔｅｒ行列式的展开方法，并得到展开系数的解析表达式，使得孪函数多电子基直接与Ｈａｒｔｒｅｅ－Ｆｏｃｋ从头计算相关联．
A set of expansion method of the twin-function multi-electron-based Slater determinant is developed. The analytic expression of the expansion coefficient is obtained, which makes the multi-electron of the twin function directly related to the Hartree-Fock ab initio calculation.