The diploma project deals with a group integration of children with mental handicap at a primary school designated for children with special needs. The thesis is divided into four chapters. The first chapter focuses on the theoretical part of the thesis. It explains key concepts such as mental disability, integration and inclusion, school and class climate, legislation. The second chapter deals with the personality of a child with mental handicap. It describes intellectual cognitive functioning, emotions and volitional characteristics, adaptability and sociability and also education and development of child’s personality. Education of children with mental handicap is described in the third chapter. This chapter presents ways of educating the children and its principles. It also focuses on their leisure time and school integration more in-depth. The fourth chapter is the practical part of the thesis. It contains case histories of students, deals with the development and conditions of group integration of children with mental handicap. Interviews with teachers are also included.