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Comparing to wire networks, there are many different characteristics in wireless environments, which make TCP congestion control mechanism is not directly suitable for wireless networks and many improved TCP congestion control mechanisms have been presented. But these improved schemes are not considered the influences to TCP senderpsilas packet sending rate by the wireless link corruption. However, unnecessary packet lost by corruption can be avoided through the decrease of packet sending rate, which may lead to higher reliability, unnecessary energy consumption of mobile hosts, and less system overheads. So, we present an improved TCP congestion control mechanism DW-TCP, it divides the TCP congestion window into two parts: dispose congestion window and dispose error-code window. It considers the influences to TCP senderpsilas packet sending rate not only by the congestion but also by the corruption. The improved mechanism can be easily implemented with fewer overheads and can effectively improve reliability with small variances of throughput and delay.