Abstract: Abstract: A SYN packet might be dropped when initiating a TCP connection in data centers, causing the tasks missing the expected deadline; accordingly, without changing the existing devices, applications and the TCP protocol itself, a viable mechanism based on WRED was proposed to avoid the drop of SYN packets. Three related key problems was solved: how to mark and recognize the SYN packets; how to reserve space for the SYN packets in switches; how much space to reserve. Compared with the original TCP protocol, the TCP connection establishment time is greatly reduced. The simulation results show that connection initialization process is properly optimized and the tasks are now finished within the deadline.