Optical Burst Switching(OBS) is regarded as one of the representative technologies for the next generation fiber-optic communication networks.In this paper
the contention issue arising from data bursts contending for the same output data channel in the OBS core node is studied
the network performances in the contention analyzed and the packet loss probabilities under different network traffics obtained.The results of the study have certain theoretical guiding significance to the construction of OBS networks.