The study aims to develop an integrated curriculum for prathomsuksa V: a case study of Tasaban Watdon Kai Dee school Krathumbaen Municipality Samutsakhon Province. The researcher uses the steps of curriculum development according to Taba (1972) , which are of course all 7 steps: diagnosed needs , set objectives , content selection , content prioritization , selected experience, priority experience and determining the assessment. Data were collected (1) an integrated curriculum. (2) integrated learning plan based on an integrated curriculum. (3) teaching and learning literature based on an integrated curriculum. (4) a questionnaire about the quality of an integrated curriculum. (5) the measure of achievement test based on an integrated curriculum and (6) the measure of students ' attitudes towards teaching.