Abstract: The article shows that among the factors of the effectiveness of pedagogical work, the personal characteristics of the teacher are important. This is due to the fact that personal qualities, such as sociability, organization, emotionality, perseverance, discipline and others, encourage the teacher to work on himself, to self-improvement. In addition, the effectiveness of the educational process depends on personal characteristics, whether the teacher will be able to find an approach to students, build trusting relationships, motivate them to acquire knowledge, create a favorable psychological climate in the classroom. A study was conducted to study the influence of characterological features on the effectiveness of the professional activity of teachers of correctional schools. In the course of diagnostics of personal qualities of teachers and comparison with the level of efficiency of professional activity, the presence of the character traits declared by us, such as organization, emotional stability, attachment and extroversion in teachers with medium and high levels of efficiency and the absence or weak expression of these character traits of teachers with a low level of efficiency of activity, was revealed. A complete analysis of the previously identified groups of effectiveness of professional activity of teachers shows that the declared qualities of character are particularly pronounced in representatives with a high level of efficiency of professional activity in 100%, and are also traced in more than half of the teachers from the group with an average level of efficiency of professional activity of 85%. In connection with the data obtained, we can talk about the influence of such character traits as: extroversion (sociability), organization, attachment, emotional stability on the effectiveness of professional activity.