In portfolio investment theory, investment risk is measured in terms of variance in yield, and although calculating risk measured in variance is simple, there are some strict assumptions that often do not correspond to reality. The following partial moment is used as a risk measurement index, which overcomes the deficiency of variance in theory, but the following partial moment is a complex solution for the resource allocation optimization model of the objective function, which restricts the application of the lower partial moment in practice. Aiming at the difficulty of solving the Harlow mean-lower partial moment resource allocation optimization model, the conversion form of the model is obtained through appropriate transformation, which is not only easy to solve, but also can obtain the accurate value of the lower bias moment statistic of the corresponding securities combination, which provides a simple and easy method for the application of the lower bias moment in investment analysis.