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Restricted floating sensor (RFS) is an important model in offshore surveillance and monitoring. However RFS suffers long transmission interval and high-energy consumption. In this paper, we propose an adaptive transmission time control (ATTC) strategy for large scaled restricted floating sensor networks. This mechanism release collisions adaptively according to changeful network topology and the condition of wireless channels periodically. Furthermore this strategy can amend the transmission interval depend on user and this is important in saving energy when the weather is fine. The experiment shows our work is succeeding in controlling the propagation delay in deferent weathers. Moreover it can prolong the lifetime efficiently and save about 50% energy when bit error rate is higher.