Role and meaning of cross-cultural studies for further development of social psychology and other branches of psychology are considered. Cross-cultural studies of the inter-group interaction and of the conformist behavior performed abroad are analyzed. Results of two cross-cultural studies of the non-verbal communication and social perception performed under the author's guidance are presented. Necessity to intensify cross-cultural studies in order to achieve progress in a number of major theoretical issues in psychology is argued. Some constructional ways of dealing with them through the media of social-psychological analysis are outlined.