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The purpose of this study was to explore the difference of school climate in senior high schools under different principal's decision-making styles in Administration, and to investigate the relationships between principals' behaviors in administrative decision-making and school climate. The study was basically a survey study. Sources of information were mainly from questionnaire study. The sample of this research included 57 public senior high schools and 1026 teachers in Taiwan. Two instruments were utilized entiled, (1) The Senior High School Principal's Decision-Making Behaviors in Administration Questionnaire, (2) Senior High School Climate Description Questionnaire. One factor analysis of variance, Pearson Product-moment correlation, multiple regression, and stepwise multiple regression technique were used for statistical analysis of data. Based on the findings of this study, seven conclusions were drawn: (1) There were some significant differences in administrative decision-making among the different sizes of the senior high schools. There was higher performance on both system and person oriented in small-sized schools, person oriented behaviors particularly, than middle-sized and large-sized schools. (2) Expect the group of the age under 55 that had higher scores in system-oriented behaviors, there was no significant difference in the relations among the groups of age in the principal's administrative decision-making behaviors. (3) There were some significant differences in the eight dimensions of school climate and the climate openness index under the four different principal's decision-making styles in administration. There was the most satisfactory climate under the style of ＂high system, high person oriented＂ decision-making behaviors, the highest scores were found in ＂Thrust,＂ ＂Consideration＂ and ＂Esprit＂ and lowest in ＂Disengagement,＂ ＂Hindrance＂ and ＂Aloofness＂. On the contrary, school climate under ＂low system, low person oriented＂ style of decision-making behaviors was the most unsatisfactory. (4) Comparison of school climate under four different styles of principal's decision-making in administration: Significant difference of school climate was found between ＂high system, high-person oriented＂ style and ＂high system, low person oriented＂ one, but not found between ＂high system, low person oriented＂ style and ＂low system, high person oriented＂ one. However the ＂high system, low person oriented＂ had a higher degree of aloofness than the ＂low system, high person oriented＂. (5) There was significant correlation between the dimensions of principal's decision-making behaviors in administration and school climate. (6) Senior high school principal's behaviors in administrative decision-making can predict school climate. Both system-oriented and person-oriented behaviors are the best predictive variables to school climate; the latter is much more predictive than the former. (7) The stepwise multiple regression analysis indicated that the twelve types of behaviors in administrative decision-making, the factors covered in this study, could account for and predict the 15% to 70% of influencing the dimensions of school climate. The most important behaviors are ＂Integration＂, ＂Demand Reconciliation＂, ＂Consideration＂, ＂Predictive Accuracy＂ and ＂Production Emphasis＂, etc. According to the above-mentioned conclusion, five recommendations for principals were suggested.
