Abstract: With the continuous improvement of network bandwidth and transmission rate,the precision of traffic monitoring based on software and hardware is lower,and the system delay is bigger.In order to solve the above problem,we propose a software traffic monitoring algorithm under the condition of high bandwidth and high transmission rate.It is high order interval message estimation method based on the low-order measured data and interval message with different order.We analyze and estimate the sampling results using relative entropy.Simulation results show that the accuracy of traffic monitoring is gradually improved and system delay is further reduced with high order interval increased.