The invention discloses a method for calculating the index parameter of a grid investment analysis model, wherein the model comprises a plurality of investment key directions as second-level indexes, and the evaluation factor of each investment key direction is used as a three-level index, and the method comprises: setting a second-level index score calculating rule and a three-level index score calculating rule; selecting a specific investment project as training calculation basic data to be substituted into the corresponding three-level index, calculating a three-level index score according to the set three-level index score calculating rule; according to the second index score calculating rules, substituting into the three-level index score to calculate second-level index scores; using the sum of the second-level index scores as the investment project score. The method is based on the grid investment analysis model, provides scoring rules according to grid investment analysis models of different voltage classes, such as the formula or added and subtracted items; can performing scoring based on the actual investment project data, and reflects the prospective earning value of the investment project objectively.