A technique specifically designed for the purpose has been used by the author for the study of communication and of interrelations in a group of 3-7 years old kindergarten children. The children as has been revealed tend to consolidate with agemates of their own sex. The trend increases from the younger pre-school age to the senior age which results in appearance of two substructures in the same collective-that of boys and that of girls. The study makes it possible to state that girls occupy slightly higher positions in the system of interpersonal relations in their group as compared with boys; at the same time they are evidently more selective in communication and are more steady in their devotions.