The purposes of this research were to study of relationship between transformational leadership of school  administrators and effectiveness of basic educational schools under the  Office  of  Chonburi  Educational  Service  Area 2.
	 The sample used in this study consisted of 96 school administrators and 305 teachers under the  Chonburi  Educational Service  Area 2. A  five ? rating  scale  questionnaire  was  used  to collect  the  data. The  statistical  devices  employed  to  analyze  the  data  were  percentage, mean ( ), standard deviation (S.D.) and Pearson?s product moment correlation coefficients ( ).
	The results were as follows:
	1.  The overall of the transformational leadership of basic school administrators under the office of Chonburi Educational  Service  Area 2  was at a high level. Considering each aspect was rated all items the high level. Sequence from the highest to the lowest: showed the inspiration or motivation, the idealized influence, the intellectual stimulation, and individualized consideration respectably.
	2.  The overall of the administrative effectiveness of basic school under Chonburi Educational Service Area 2 was high level. Considering each aspect was rated at the high level. Sequence from the highest to the lowest: showed was the budgeting administration, the general administraton, the personal administrative, and the last was the academic  administration respectably.
	3. The transformational leadership of school administrators was significantly and positively related to the administrative effectiveness of basic educational school at the .05 level, relevant to the proposed hypothesis.
