The authors describe and propose ways to determine the level of school disadaptation. Associated psychological factors are identified: levels of school motivation and adaptation, situational and personal anxiety, indicators and forms of aggression, self-esteem of depression. The obtained experimental data on the tendency to disadaptation are analyzed, as well as the psychological factors that influence the formation of disadaptation of young school children are investigated. Quantitative and qualitative analysis of mental states and personality characteristics of elementary school children with disadaptation shall be conducted to study their school disadaptation, organization of comprehensive psychological and pedagogical assistance to school children, teachers and parents. Existing research methods are mainly based on self-estimation methodologies. Experimental data on addiction to disadaptation was obtained, additionally, the psychological factors, which influence on disadaptation formation of elementary school children, were examined. The majority of examined children were found to have a low level of reactive anxiety and a high level of personal anxiety.