This paper deals with the main problem of involving information technology in teacher education - structure and contents of teachers' training courses based on distance learning. In Lithuania, the Standard of computer literacy for educators has been developed. It should be the main source of all teachers' training courses on information technology. The Standard consists of two parts: technological and educational. The main attention of the paper is paid to the analysis and requirements of the educational part that becomes more and more urgent: it requires some psychological, cognitive, social, and pedagogical knowledge referring to the information technology usage in education. This paper comprehensively covers the problems of application of information technology in education, course planning, and implementation of distance teaching, it referring to the teachers' training course on educational issues of information technology via distance learning, carried out by the Ministry of Education and Science of the Republic of Lithuania and organized by the Centre of Information Technologies of Education, and summarises its results.