Abstract: To increase the acoustic absorption bandwidth of traditional micro-perforated panel absorber (MPPA), three composite MPPAs with different series-parallel combination structures are proposed in this paper. Firstly, according to the acoustoelectric analogy method, the analytical calculation models of normal incident acoustic absorption coefficient for composite MPPAs are established. Then, by preliminarily designing the structural parameters of different kinds of MPPAs, their broadband acoustic absorption characteristics are analyzed and the multi-population genetic algorithm is used to optimize their average acoustic absorption coefficients within 500～3 600 Hz. Finally, the finite element method is used to perform the simulation experiment of acoustic absorption coefficient for the composite MPPA with optimal acoustic absorption performance. The results show that the broadband acoustic absorption performance of the proposed composite MPPAs is superior to that of the traditional simple MPPA, serial coupled MPPA and parallel coupled MPPA; the optimized composite MPPA has excellent broadband acoustic absorption performance in the frequency range of 500～3 600 Hz, and its average acoustic absorption coefficient is up to 0.92, which can provide a good solution to broadband noise control.