Abstract: Arbitration mechanism can deal with contentions caused by the bus preemption of multiple masters in SoC,thus the performance of the system is improved.An adaptive and weighted dynamic arbitration algorithm is proposed.At the beginning of each arbitration cycle,the proposed arbitration algorithm checks working environment,then requests can be changed correspondingly to achieve quick response or complicated bandwidth allocation.Arbitration can be accomplished when combing the advantages of RR and FP arbitration algorithms.In NINP model,verifications are made on Xilinx Virtex5 with 65 nm CMOS technology.The experimental results show that the proposed arbitration algorithm is better in bandwidth allocation and can avoid "starvation" and "monopolization" of buses in comparison with conventional arbitration algorithms.Furthermore,the bus utilization increases by 11.35~56.3%.The proposed arbitration algorithm is simple in logic,easy to implement and suitable in various environments of SoC applications based on buses.