Abstract: The way of tracer technology to research the injected and the dispersed liquid's flow characteristic in miscible flooding by injecting some gas tracer has been proved to be an efficient method. Based on the research of many literatures about gas tracer, analyzing many interrelated characteristic factors about gas tracer flowing in porous medium, a parameter pool and a corresponding target of evaluation system is built up by selecting hypersensitive parameters. By uniting the knowledge of Petrophysics and Reservoir Engineering evaluation, rating the evaluation of target, introducing decision-making method, utilizing the best project, builds a new integrating evaluation and filtrating way in the miscible reservoir. It indicates every sensitivity factor's integration influence on the result of gas tracer election.