The purposes of this research were to study and compare the participation of school committee under the Office of Chanthaburi Primary Educational Service Area 1 in the following 4 aspects : supervising the operation of primary school, supporting and encouraging the operation of primary school, administering personnel for teachers and educational personnel in primary school and operating other works as required by law, regulation and announcement of important policies according to size of primary school and component of school committee. Population used in this research were school committee under the Office of Chanthaburi Educational Service Area 1 . consisting of 98 schools with 1,032 people in the academic year of 2011. The sample group of 35 schools with 280 people was determined by the Krejcie and Morgan’s Chart and stratified random sampling determination. The tool used in the research was questionnaires with general data and participation of school committee. The statistics used for data analysis were frequency, mean, standard deviation, and t-test