Purpose. To show problems of law-enforcement activity in multiethnic community and to define on this basis possibilities of police work improvement in culture diversity conditions. Methodology. The study was carried out with application of general scientific methods of social phenomena knowledge (analysis, analogy, comparison, etc.) with a support on methodological provisions and conclusions recognizing ethnocultural social processes as a complete, but contradictory phenomenon. Such understanding caused use of system and dialectic approach. The empirical base of article includes materials of interview “Ethnic prodlems in police officer activity” (October, 2016 – May, 2017). The research was conducted in Volga Federal District on basis of Nizhny Novgorod Academy of Ministry of Internal Affairs of Russia among police officers from among average and the senior commanding structure studying at the departement of professional development and at the graduate military course in Academy and representing various regions of Russia: Nizhny Novgorod Region, Moscow region, Krasnodar Krai, Perm Krai, Krasnoyarsk Krai, Stavropol Krai, etc. Target selection – 134 persons. Results. The difficult contradictions accompanying the society polietnization come to light, an influence of these contradictions on activity law-enforcement practice is analyzed. On the basis of Russian and foreign researches materials theoretical aspects of police officers activity in conditions of ethnic heterogeneity are revealed. The empirical analysis of law-enforcement activity in cultural heterogeneity circumstances is submitted. Ethnocultural aspects of police officers training in educational institutions of the Ministry of Internal Affairs of Russia are condemned. Vectors of cross-cultural communication in police officer work are defined. Practical implications. Results of work are intended for improvement of law-enforcement system work in conditions of ethnocultural heterogeneity.