ENThe goal of the research was to determine the interrelationship of senior form schoolchildren’s personality peculiarities and school adaptation difficulties. The research was carried out in 1997-2001. The research participants were 969 the ninth form schoolchildren from 15 Kaunas secondary schools during 1997/ 98 school years. Research methods: Minnesota Multiphasic Personality Inventory for Adolescents (MMPI-A). School adaptation indicators: Achievement, School attendance in the 10th, 11th and 12th forms, Pupils’ dropout. The results of the present study revealed that senior pupils’ school adaptation difficulties arc related to their personality peculiarities.