The  purposes  of  this  study  were  to  study  and  determine  the  administrative  factors  that  affecting  to  school  based  management  of  school  administrators  Rayong Province.  The  sample  group  consisted  of  180  persons  of  teachers, school?s  managers  and  the  basic education  commissions. A  five-rating  scale  questionnaire  (Likert?s scale)  was  used  to  collect  the  data.  The  item  discrimination  was  between .22 - .73 and  reliability  value  was .97.  The  statistics  used  in  the analysis  included  Mean ( ), Standard  Deviation (S.D.) and  Stepwise  Multiple  Regression  Analysis.
 	The study results revealed were as follows: 
 	1.  The  administrative  factors  of  Rayong  Municipal  Schools, Rayong  Province  both in overall and  each  item  were  at  the  high  level.
 	2.  The  school  based  management  of  school  administrators  of  Municipality Schools, Rayong  Province, both  in  overall  and  each  item  were  at  the  high  level.
 	3.  Administrative  factors  affected to school based  management  under Municipal Schools in  Rayong  Province  found  that  service  and  product  factor, financial  efficiency  factor  and management  factor showed  the  revealed  outcome  which  can  be  whiten  by  predictive  equations  in  regression  form  as  following;

            Y = .73 + .20(X2) + .12(X4)+.29(X6)
