The purpose of research were to study the Leader behavior of Basic school Administrators under the office of Chachoengsao Educational Service Area I in 7 items in initiator improver, recognizer, helper, effective speaker, co-ordinator and social man and compare leader behavior of Basic school Administrators under the office of Chachoengsao Educational Service Area I and classified by position, working experience and school size. Sample consisted of 117 adminstrators and 334 teachers. The instrum
ent used for collecting the data was a 5 rating scales questionnaire 56 items. The stalistics employed in analyzing were mean, standard deviation, t-test and One-way ANOVA.
	The results found that: 
 	1. Leader behavior of Basic school Administrators under the office of Chachoengsao Educational Service Area I in all and each aspect were at the high level. The means ranked from the highest to the lowest were recognizer, co-ordinator, social man, initiator, helper, improver and effective speaker 
	2. When compare and classified by position, working experience and School size. It had different significance on .05 level on position and School size and it had not different significance on working experience.
