The purpose of the article was to present the results of the study of the impact of social and psychological training on the formation of volleyball team efficiency. The objectives of the research were to investigate student volleyball teams' efficiency; identify social and psychological factors that determine team efficiency; to analyze peculiarities of influence of the social and psychological training developed by the authors on the formation of teamathletes' efficiency; to investigate the changes in social and psychological processes that are related to theeffectiveness of the team sporting activities. Theoretical analysis of the problem of efficiency of the team sports activities allowed to identify the main determinants, components and ways of this social and psychological phenomenon development. The specifics of sporting activities and relationships in sports teams imposepossibility of solving this problem. It was determined that sports team had all the characteristics of a small group. The same social and psychological processes took place as in other small groups, so the ability to manage these processes is common to small groups, but the specifics of interaction in a sports team impose certain limitations on the possibility of psychological influence.Also, the role of a coach in team activities, the situation of wins and defeats in each particular case, the composition of the team, gender and age of athletes should be taken into account. Material and methods. Participants.The study involved players of student volleyball teams of high educational institutions in Kharkov, Slovyansk, Donetsk region, Chernihiv, Ukraine (n = 132, aged 17-23). The main results of the study were a significant increase in team effectiveness of volleyball teams, namely, increase of victories in competitions; improvement of social and psychological climate of the team, reduction of aggressiveness and conflicts; increaseof dependence on group norms, values, assessments; increase in desire to communicate, new interpersonal relationships, fight for the status of a team; reducing the level of social frustration; growth of adequate variability of behavior and expression of feelings in the process of interaction; development of empathic abilities, interest towards people, ability to empathize, empathy. Conclusions.Thus, use of psychological technologies, in particular, social and psychological training, is an effective means of forming and developing team efficiency in sporting activities .