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It is investigable how the system scalmg affects the system cunplexity degree.The traffic flow system is taken in this paper as an illustration to study this question.First,the Lempel-Ziv algorithm is introduced for accurate depiction of the complexity degree of the traffic flow system.We gain 3 actual sequences and 20 s period traffic flow sequences off the basis of the ineasure of the traffic flow data;we gain 5 traffic flow sequences whose periods are between 1-5 min by simulating the traffic flow system.By calculating the complicacy of the 11 sequmces,we obtain two hypothesis:the complicacies of the same system are different tmder different time scalings;negative correlation exists between the complicacy and the time scaling of the system.