The article analyzes the essence and relationship of the concepts «learning technology», «information and communication technology of learning», «environment», «educational environment of primary school». The impact of the use of ICT in the learning process on the development of mental processes of primary school students is analyzed. It has been established that the use of information and communication technologies in the process of teaching primary school students provides a significant impact on the development of thinking, expression, attention, perception, memory, by including schoolchildren in new types of activities: algorithms, modeling, visualization, abstraction, game imagination. It has been established that the introduction of information and communication technologies into the educational process affects the environment where primary school students learn. It was determined that the digital educational environment in educational institutions should include: information support of the educational institution, the formation of the teacher's information and communication competence, computer-oriented learning tools for primary school students. Features of the use of information and communication technologies in computer science lessons are characterized.The experience of using game, project, multimedia and web technologies in the process of studying of the subject «Computer Science» is highlighted. It was established that the use of information and communication technologies allows: to increase the cognitive activity of students due to the brightness, variety in form, visibility of the educational material; to individualize the learning process using tasks of different complexity; to form the ability to work on a personal computer by using game types of tasks; to improve self-control skills, the ability to independently adjust one's activities by performing project tasks; to independently conduct educational and practical activities, developing creative activity among schoolchildren.