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In this paper, we evaluate TCP performance in optical burst switched (OBS) networks with multiple TCP flows. Several performance metrics are studied, which include TCP throughput, fairness, retransmission ratio and stableness the OBS network with multiple TCP connections. The study is also extended to burst TCP (BTCP) proposed for OBS networks in particular. Our work provides a more comprehensive understanding of the congestion control and stableness of current existing TCP in OBS networks and sheds lights on the better TCP design for the OBS networks.