Based on the given securities combination model and the justified general principle of the invertible matrix, the analyze expression formula of securities investment combination right counting was deduced and justified with the examples.

• 摘要给出了证券组合模型，在其使对称矩阵与对角矩阵合同的可逆阵的一般规律基础上，推导出证券投资组合给合权数的解析表达式，并给出实例验证。