Abstract: It is very important to make a quantificational description for the characters of systematic structure between transportation system and social economic system.The Lempel-Ziv algorithm of information theory is introduced to measure the complexity，one of the characters of systematic structure.Aiming at the limitation of this algorithm，the universal cut-and-try algorithm is put forward.The complexities of macroscopic traffic volume and GDP time series are calculated，respectively.The results show：the complexity of GDP has a positive correlation with the complexity of freight traffic volume；the influence of the complexity of GDP on the complexity of macroscopic traffic volume is long-term with lagged effect；and the correlation between GDP and macroscopic traffic volume has an uncertain relation with the correlation between their complexities.