Abstract: The author of the article makes an attempt to apply the concept of the metasystemic organisation of mental processes to research of learning activity. The subject of the research is the metaregulative influence of interpersonal relations of a learning actor on the process and success of learning. The author views learning activity as a system with a metasystemic level consisting of motivational processes. Other components of this system includes: direct academic activity as an individual system; success of learning activity; actor of learning activity; relations of an actor of learning activity. The empirical proof of the hypothesis included two stages. At the first stage the author conducted a general analysis of interpersonal relations, intensity of participation in extra-curricular activity and learning activity and their results, construction of predicative models allowing to predict success of learning. At the second stage the author carried out a teaching experiment allowing to prove the metaregulative influence of interpersonal relations on learning activity. The author has used the following methods: experiment, survey, semantic differential of interpersonal relations, inventory to assess one's ability to have a dialogue in interpersonal relations, and V. Leontiev's psychographic test. Statistical processing of the results was made by using the Statistica application. The main conclusions of the research are as follows: 1) application of the concept of metasystemic organization of mental process to studying learning activity significantly expands opportunities of understanding how learning activity is performed and what means regulate it; 2) the author has also discovered the metaregulative influence of interpersonal relations on one's learning activity; 3) the author has empirically proved the positive influence of interpersonal relations on one's learning activity and academic success.