The aim of this research was to study factors and levels of public participation in good local management system of Khlong Na Rai Sub-district Administration Organization in Muang District, Chanthaburi. The survey research design was applied to this study. The research
populations determined by the Taro Yamane’s sample size were the 400 qualified voters. The descriptive statistics were percentage, mean, standard deviation, t-test, one way analysis of variance, and the LSD analysis. The results revealed that public participation levels of people in the Khlong Na Rai area were at the moderate level. People showed the public participation
aspects as fullows : Rule of Law, Accountability, Morality, Responsibility, and Participation. Besides, the participation aspect of Cost-Effectiveness or Economy was differently shown with the .05 level of statistical significance in the people of different ages, marital status and education levels.