In this study, multi-objective optimization of radar absorbing structure with circuit analog structure using the genetic algorithm was investigated, at the basis of the study on the influence of the size of the circuit analog, the electromagnetic parameter and the thickness of the medium ply on the properties of the microwave-absorbing composite. Based on the concept of Pareto optimality, Sharing and Niche technology was applied in the algorithm(NSGA), and the calculating results converged at the Pareto front dividedly. The study have been showed that the calculating values fit well with that of the experiment, which indicate that this algorithm is proper and has extensive adaptability. The results also showed that introducing circuit analog structure(CAS)into the radar absorbing structure composite design can improve its wave-absorbing properties. So, the radar absorbing structure composite with CAS is a promising radar absorbing structure composite form.