Now a large number of intermediate nodes face a fact of using drop tail queue management

therefore a random back-off TCP congestion control algorithm named TCP Njust is proposed.When congestion occurs

randomly reduce the congestion window within a certain range

but when congestion avoid

congestion window is randomly increased within certain limits to reduce TCP global synchronization.This algorithm requires a random function on the base of Newreno.Simulation results show that this algorithm performs better than Newreno

and also better than Vegas when a large number of burst data stream occurs in the network

and it's suitable for use in the internet.