Based on the theory of portfolio investment. a two-argument mathematic model is established in the paper By comparison with the riskminimum criterion the criterion of expected utility maximum is fitter for the reality.

• 本文结合证券投资有关理论建立了二元组合证券投资的数学模型，并就风险最小和期望效用最大两种评价标准进行了比较，指出后者更加符合实际。