Acculturation - this intercultural contact of various societies. When contacting legal cultures subject to investigation legal of acculturation. The article reveals the mechanism of legal acculturation as a set of interrelated, interdependent methods, tools, techniques and factors providing intercultural contact of various societies. Parties acculturation: the society-recipient, society-donor, society-partner. In the process of legal acculturation are the following steps: identification of needs, borrowing, adaptation, perception (assimilation), result. Depending on the position of society enters into intercultural contact and acculturation distinguish legal mechanism such historical forms as reception, expansion, assimilation, integration and convergence. The author applied the historical-cultural studies approach.