The article analyses the theoretical aspects of the problem of socialisation of children with Down syndrome and hearing impairments, providing them with comprehensive psychological and pedagogical assistance and developing their social competence. An important task is to analyse the problem of early manifestation, psychological support and the development of social competencies in children with Down syndrome and hearing impairment. The authors of the article state that the problem of organising medical and psychological support for children of early age with Down syndrome, monitoring their health status and psychomotor development is becoming more and more relevant, which is connected with the crucial importance of the first decades of life of a child with such a disorder for their further development and adaptation in society. The article dsells upon the concept of “social competenceˮ in children with Down syndrome and hearing impairment. Common to almost all definitions of competence is understanding it as a child's ability or readiness to cope with various social tasks, which in turn depends on the acquired knowledge, abilities and skills needed to perform a certain job. Therefore, the acquisition of knowledge, skills and abilities are not the result of acquiring knowledge, but an intermediate mandatory goal, though not the main component of the educational result. The importance of hearing development in the early stages after cochlear implantation and the corresponding remedial developmental work have been clarified. It is vitally important to stimulate the cognitive development of children with Down syndrome, especially at preschool age, because language development is the cornerstone of a child's healthy and fulfilling life, which specialists and teachers strive for, which in turn will form the child's high social competences. Thus, the identified problem is important, since the main conditions for effective psychological support and development of a child with Down syndrome and impaired hearing are early detection of hearing impairment, timely hearing prosthesis and cochlear implant adjustment, as well as the creation of an educational space conducive to successful learning and full-fledged personal development. The impact of hearing loss in children with Down syndrome has serious consequences for the further development and formation of the child's social competences. It is known that hearing loss leads to many developmental problems, including: delayed or absent speech development, impaired communication skills, problems with reading, writing and other skills, low academic performance, social isolation, etc. Keywords: children with Down syndrome, hearing impairment, cochlear implantation, remedial and developmental work, social competencies.