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Most of existing transfer protocols performs poorly for transferring bulk data over fast long distance network. A key reason is the congestion control algorithm. This paper designs a novel congestion control algorithm, namely congestion detection and rate adaptation (CDRA) algorithm, which adjusts sending rate according to the congestion level of terminal in order to maximize transfer performance. For implementation, a modified protocol based on the UDP-based protocol Tsunami, called robust Tsunami (RTsunami), was developed. The experimental results show that the CDRA algorithm is efficient and the RTsunami protocol outperforms Tsunami.