The purposes of this research were to investigate the effects of administrators traits to School Based Management (SBM) under the Office of Chachoengsao Primary Educational Service Area 1. The sample of this study were 417 participants from school administrators and teachers under the Office of Chachoengsao Primary Educational Service Area 1. The research instrument was a five - rating - scales questionnaire. The statistical analysis included mean, standard deviation and multiple regression analysis was used.
 	The findings were as follows:
	1. Administrators traits under the Office of Chachoengsao Primary Educational Service Area 1 was at a high level ranked as leadership, personality, academic matters, morality, administrative abilities respectively.
	2. School Based Management under the Office of Chachoengsao Primary Educational Service Area 1 was a high level ranked as the self-management, the decentralization of management, the management which people had more authority, the verification the balance, the participated management respectively.
	3. There was the effect of administrators traits to School Based Management. There were 45.40 % of School Based Management predicted by leadership, academic matters, morality, personality and administrative abilities effect to School Based Management significantly. As the following prediction equation:
                               
	Z'y =  -.004X1 + .052X2 + .487X3  + .140X4 + .026X5
