Social environment of a person has a significant impact on criminalization of a person . Scientific literature analyzes the criminogenic influence of its individual participants — family members and relatives, members of informal groups and communities . Consequently, its structural organization, key functions of relations with social environment, possibilities of their change for decriminalization and post-penitentiary reintegration are unclear . Objective of the study: to examine relationship of a criminogenic person with social environment . Methods: method of data collection is a survey . Parameters of social environment that are studied: volume, stability, homogeneity, limitations of autonomy and reference; studied characteristics of interaction: received support and assistance, effectiveness of interaction, influence . The methods of processing results are descriptive statistics and rank comparison criterion (Mann-Whitney U-criterion) .The study sample consists of 388 people, 171 of whom are classified as persons with law-abiding behavior (Mean age — 36,3 years, SD — 12,3 years; men — 77 %) . The remaining part is made up of persons under administrative supervision, of whom 114 persons were under criminal punishment for the first time (Mean age — 31 .5 years, SD — 8 .42 years; men — 84 %); 103 persons who had been previously subjected to criminal punishment (Mean age — 37 .7 years, SD — 11 .13 years; men — 73 %) .Results and novelty: new information was obtained about parameters of social environment of a person with criminogenic behavior (small volume, high stability of composition and homogeneity of participants, low referentiality, selectivity of social relations) . The influence of parameters of social environment of a person and relations with it on post-penitentiary re-integration is noted.