	The  objectives  of  this  research  aimed  to  study  and  compare  team-working  behaviors of  school  administrtrators  under  the  Office  of   Chachoengsao Educational   Service  Area  I  as  classified  by  position, work  experience  and  school  size.  School  administrators  and  teachers  were  grouped  of  451  samples  in  this  research.  Research  tools  used  for  collecting  the  data  were  a  set  of   Likert?s  5- item  rating  scale  questionnaire.  Percentage, frequency, mean, standard  deviation,  t-test  and  One ? way  ANOVA  were  employed  for  data  analysis.    
	The  findings  were  as  follows :  
 	1.  Team-working  behaviors  of  school  administrators  under  the  Office  of  Chachoengsao  Educational  Service  Area  I  showed  the  overall  and  each  aspects were at  the  high  level  of  respondents?  opinions.
 	2.  Team-working  behaviors  of  school  administrators  under  the  Office  of  Chachoengsao Educational  Service  Area  I  which  classified  by  position, work  experience  and  school  size    revealed  no  statistically  significant  difference.  
