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The low spectrum utilization has limited the development of wireless communication is a common view In Cognitive Radio (CR). And the idle spectrum holes are too narrow to support high-speed communication is an another problem. The spectrum aggregation technology is supposed a hopeful method for the secondary users (SU) access to the idle spectrum. In order to improve the spectrum utilization, a spectrum allocation algorithm aware of spectrum aggregation is proposed in this paper. By aggregating different idle spectrum fragments and assigning them to the SUs by an opportunity way, the spectrum utilization is improved. The numerical results in the simulation shows the proposed algorithm successfully improves the spectrum utilization in the CR networks.