In 2010,the 41st World Expo was held in Shanghai.More than 73 million visitors visited the Expo and created a new record.Such a huge number of visitors cause queuing and waiting phenomena around popular pavilions.Noticing that the time correlation of queuing length and waiting time helps visitors better choose their desired pavilions,a detrended fluctuation analysis (DFA) method to analyze the potential long-range dependence of queuing behaviors.The results show that the queuing length time series of most pavilions yield the long range correlations; while some of popular pavilions yield the long range anti correlation.