“我的小孩刚进小学时天真活泼,上了几年学就大变样,乱发脾气,倔得很!” “真怪!我孩子只九岁,一天到晚闷声不响,不知道他在想什么?” “怎么他小小年纪变得象小老头?”……这是一些家长的反映。这些反映是真的吗?这些“怪事”是个别的还是普遍现象?是什么原因造成的?带着这些问题,我们调查了南京市某小学一到五年级556名学生的个性变化情况。在心理学研究中,个性差异由兴趣、能力、气质、性格几方面的综合因素决定,气质以神经系统的强度、平衡性、灵活性三方面 “” “Really strange! My child is only nine years old, all day and night, the sound does not ring, Do not know what he was thinking? ”“ How did he become a little old as a young man? ”“ ... This is some parents’ reflection. Are these reflections true? These ”strange things" are isolated or common phenomenon? What causes these problems? With these questions, we investigated the 556 students in primary schools in Nanjing, a change in personality. In the study of psychology, personality differences are determined by a combination of factors such as interest, ability, temperament, and personality. Temperament is determined by the strength, balance and flexibility of the nervous system