The invention discloses an intelligent power grid transmission and transformation project evaluation index system establishing method. The method includes the following steps: acquiring an index item; establishing a preliminary evaluation index system and correcting the preliminary evaluation index system; analyzing the degree of association among indexes and arranging the indexes in order; adjusting the indexes; once again conducting correlation analysis so as to obtain a final evaluation system. According to the invention, the method herein can obtain an optimal evaluation index system by selecting candidate evaluation indexes as much as possible, computing the degree of association among the evaluation indexes and selecting and sorting the evaluation indexes on the basis of the degree of association. Therefore, the method herein can obtain a scientific, reliable and complete intelligent power grid transmission and transformation project evaluation index system. The method is also advantaged by low complexity and excellent applicability.