The purpose of this study was aimed to identify the relationship between service quality and behavior by spectators participating security exhibition. The subject for this study was spectators who participating World Security Expo 2014 held three days from March 12 to 14 in 2014. 350 samples were selected by convenience sampling for subject of this study. 320 out of 350 surveys, excluded 30 unfaithful and defected surveys, were used for data analysis. Research tool was questionnaire which was based on and recomposed by previous researches home and abroad. The collected data were treated for analysis of frequency, reliability, factor analysis, correlation, and multitiple regression analysis by using SPSS statistic package version of 18.0 Through the above research method and procedure, the results were as followings. First, the relationship between service quality and behavior after participating exhibition appeared positively. It was found that there was high relationship between service quality and behavior. Second, analyzing relationship of factors between service quality and behaviors resulted to effect perceived environment, human services, and product on word of mouth. Third, analyzing relationship of factors between service quality and behaviors resulted to effect perceived environment, product, and price on re-participation.