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Towards the MAC design of the dynamic sharing spectrum communication system, this paper proposed a new MAC frame structure which can be used in centralized networks. And design a Slotted ALOHA access control algorithm based the feedback competition CSI (channel state information) of access users. Then through analyzing the delay features and the stability, we propose a new MFpBA to assure the system stability, which is the combination of pseudo-Bayesian algorithms (pBA) and the multiple factor (MFpBA). Simulation demonstrates that the algorithm can accelerate the adjusting speed and acquire stable throughput on the conditions that there is distinct difference between the probability of transmitting and the actual.