This study aimed to determine the predictive power of the theory of planned behaviour in predicting the intention and behaviour of positive thinking in school students. A cross-sectional study was performed on 367 high school male students in Iran. Data were gathered using a researcher-made questionnaire whose validity and reliability had been confirmed before. Descriptive and inferential analysis (univariate and multiple logistic regression models, Pearson correlation) was performed using SPSS software V.20. AMOS version 22 was used to perform the path analysis. According to the results, the construct of attitude was the most important construct in predicting positive thinking intention. Finally, the theory of planned behaviour constructs could predict 36% of intention variance and 20% of behaviour variance of positive thinking. Since the construct of attitude is one of the most powerful constructs in predicting student positive thinking intention in male teens, it is recommended that more attention be paid to this construct in educational programs to improve the mental health of male high school students. The results of this study can help psychologists and counsellors, families, and teachers improve students’ mental health.

本研究旨在确定计划行为理论在预测学生积极思考的意图和行为方面的预测能力。对伊朗 367 名高中男生进行了一项横断面研究。使用研究人员制作的问卷收集数据，其有效性和可靠性之前已得到确认。使用 SPSS 软件 V.20 进行描述性和推论分析（单变量和多逻辑回归模型，Pearson 相关性）。AMOS 版本 22 用于执行路径分析。结果表明，态度结构是预测积极思考意图的最重要结构。最后，计划行为构造理论可以预测积极思考的 36% 的意图变异和 20% 的行为变异。由于态度结构是预测男性青少年积极思考意图的最有力的结构之一，因此建议在教育计划中更多地关注这一结构，以改善男性高中生的心理健康。这项研究的结果可以帮助心理学家和辅导员、家庭和教师改善学生的心理健康。