Abstract: For the features of network user behavior,two evaluation rules of multi-scale sample entropy are used to analyze P-P flow traffic matrix.The method can reasonably explain some of the features shown in the network traffic and draw some interesting conclusions.Then a method to evaluate healthy degree of traffic time series is proposed based on analysis capacity of multi-scale sample entropy.Experiments conducted with actual network traffic and simulation network traffic show that the proposed method is simple and effective,and can accurately evaluate the healthy degree of network traffic.