The evaluation of System of Systems(SoS) contribution rate is an important index for the effectiveness assessment of electronic information equipment SoS. Taking a typical electronic information equipment for example, the essence of electronic information equipment SoS is investigated, and its complexity such as openness and dynamic property are analyzed. It is pointed out that the contribution rate of electronic equipment SoS should be evaluated by systematic theory. Based on the meta-synthesis method, the integrated method process of contribution rate evaluation of typical electronic information equipment SoS is studied by taking radar equipment as an example, and three important steps of the process are given, including the qualitative integrated judgment and understanding of the connotation, essential characteristics and function mode of contribution rate of electronic information equipment SoS, the indexes selection and evaluation combined with qualitative and quantitative evaluation of SoS contribution rate, as well as the comprehensive integration methodology from qualitative to quantitative analysis and verification of system contribution rate evaluation indexes, which provides reference for contribution rate test and evaluation of electronic equipment test system.