Optical burst switching (OBS) is a promising solution for the next generation backbone internet which can exploit the hugy bandwidth of dense wavelength division multiplexing(DWDM) technology and the flexibility of electronic switching. An improtant issue in OBS technology is burst contention which causes performance degradation. The optical buffer resolution based on segmentation segments burst firstly, and then the segmented burst is buffered. The wavelength conversion conflict resolution based on segmentation segments burst firstly, and then the segmented burst is wavelength converted. Comparison between the two contention resolutions is made. The result of comparison shows that when the network load is high, the optical buffer conflict resolution based on bust segmentation can efficiently reduce the burst loss probability. When the network load is low, the wavelength conversion conflict resolution based on bust segmentation can efficiently reduce the burst loss probability.