To increase the night use level, this study was analyzed perception of users about the public safety, and extracted main variables which were influencing public safety. The public safety was evaluated by the actual (on site) and nonactual users (off site) and the Delphi method. The night users of female and the elders were relatively more than male and the young respectively as compared with day. Walking was predominant in approaching means. In public safety ratings, $oxDr$vuknerability to violence$oxUl$varied accoding to sex, income, education, marriage, job, age. $oxDr$crowding, $oxDr$noise$oxUl$ were important variables in satisfying users at night. $oxDr$Lack of surveillance, $oxDr$harassment of other person$oxUl$, $oxDr$rowdy behavior in poorer visibility$oxUl$, $oxDr$fear in lower intensity of light$oxUl$ and $oxDr$vulnerability to violence$oxUl$stood high , so it is required guarantee of security guard to enhance the park use at night Although the ratings between field and indoor evaluation were somewhat different the variables had so similiar rant