To obtain the high absorptivity and broad bandwidth, a resonant metamaterial absorber composed of split rings is designed and investigated numerically by employing the frequency domain solver of the commercial software (CST Studio Suite 2009). The calculated absorption spectrum in 25~35 GHz range shows that a very high absorption of 86%with a broad bandwidth of 3.5 GHz can be achieved. Moreover, its absorbing performances in THz frequency are investigated. The complex absorbing structure by combining the elementary absorber based on the superposition effect of absorption at different frequencies is also discussed.It is shown that the complex metamaterial absorber can reach a nearly perfect absorption of 99.9%,with the bandwidth of 3.1 GHz. To minify 1 000 times of the absorber size in GHz frequency, the perfect absorber can be achieved in the THz frequency, thus providing a means to dynamically control the absorbing band. Obviously, the absorption is increased largely when compared to that of the elementary absorbers. Meanwhile, different simulation results of diverse arrays can be calculated. Due to the interaction of the ring resonators, the absorption effect can be influenced and absorption rate decreased. This metamaterial consists entirely of metal structure which allows for maximization of the absorption through independent controlling the electrical permittivity and magnetic permeability.