The invention discloses an index system constructing method for overall efficiency of a network. The index system constructing method comprises the following steps: S1, preliminarily drawing up a key index set, selecting key efficiency indexes and determining an index set; S2, refining same-layer indexes and calculating weight, and constructing weight factors of the efficiency indexes relative to the integral efficiency; S3, calculating cross-layer index weight, realizing index weight weighted calculation of a high layer relative to a layer adjacent to the high layer and further realizing index weight weighted calculation of a higher layer on the relative high layer, thereby forming an integral efficiency estimation function with weighted weight. According to the index system constructing method, integral efficiency of the network is estimated by selecting efficient indexes from different levels and different aspects, so that problems of one-sidedness, limitation and the like in a single performance index estimation process in the prior art are effectively solved, and the integral efficiency and the group efficiency of the system are reflected better.