The main purpose of this study is to analysis the relationships between the school climate and pupil control ideology by the school size in the elementary school. For this purpose, the study was conducted as follows: Firstly, what difference is there between the school size and the school climate type?(Classification of two school climate type: open climate/ closed climate) Secondly, what relationship is there between school size and teacher\'s pupil control ideology?(Classification of two pupil control ideology type: custodial orientation/ humanistic orientation) Thirdly, what difference is there between the school climate and teacher\'s pupil control ideology? Fourdly, Secondly, what relationship is there between school size, the school climate and teacher\'s pupil control ideology? As the research method to resolve these issues of study, both the descriptive study and the research study through the questionnaire method were used in combination. The findings were summarized as follows: 1) As a result of inquiring into whether there is a difference in the level of the teacher\'s awareness of the school climate type with the school size, it was shown that closed climate type of school climate according to the large size of school was significantly different at 5 percent level. 2) It was shown that the teacher\'s custodial orientation of PCI according to the large size of school was significantly different at 1 percent level. 3) The school climate and the degree teacher\'s pupil control ideology according to the large size of school was significantly different at 5 percent level.