The  objectives  of  this  research  were  to  investigate  the  problems  of  school  curriculum  development  of  educational  opportunity  expansion  schools  under  the  Office  of  Chonburi Educational  Service  Area 1, and  to  compare  those  problems  of  school  curriculum  development as  classified  by  position, work  experience  and  school  size. The  samples  consisted  of  22  school administrators  of  educational  opportunity  expansion  schools  and  176  teachers  who  ruled  as the  head  of  learning  strands  from   these  schools. The  instrument  used  for  collecting  data  was  a  set  of  5 - item   rating  scale  questionnaire.  Percentage,  mean, standard  deviation,  t - test  and  One  Way  ANOVA  were  employed  for  data  analysis.
	The  findings  of  research  were  as  follows;
	1.  The  problems  of  curriculum  development  of  educational  opportunity  expansion schools  under  the  Office  of  Chonburi  Educational  Service  Area 1  as  a  whole  and  each  aspect  were  at  a moderate  level.
	2.  Comparison  of   the  problems  of  curriculum  development  of  educational  opportunity expansion  schools  under  the  Office  of  Chonburi  Educational  Service  Area 1 as  classified  by position, there  were  not  found  statistically  significant  differences. There  were  statistically significant  differences  at  the  level  of  .05  when  classified  by  work  experience and school  size  both  in  overall  and  each  aspect.  Moreover,  the  comparison  of  mean  differences  employed  by  Scheffe?  method  had  shown  statistically  significant  differences  at  the  level  of  .05  between  small  size  schools  and  the  medium  ones, but  the  other  pairs  had  not  found.
