The purpose of this study was to investingate Personal ATI Theory on preschool teachers. Personal ATI Theory is a personal belief system on how to treat children according to their aptitudes. This system is assumed to influence teachers' caring activities. 347 teachers were asked to read three cases of children with minor behavioral problems and to answer the questionnaires on their teaching methods in each case. The item mean scores and the factor analysis revealed that teaching methods varied according to the cases and teachers' caring experiences. The findings were discussed with reference to Personal ATI Theory.