Abstract: "Mishing is an ethnic indigenous community mainly found in the north eastern part of India. They reside in the states of Arunachal Pradesh and Assam. They are of mongoloid origin, belong to the Tibeto-Burman family of Indo –Chinese group. This ethnic community have an indigenous communication system, to communicate their culture within the community and to the outsider. They applied religious belief, ritual symbols, dance, song, musical instruments and folklore as a communication agent. The indigenous communication system of the tribe is under threat due to acculturation. The paper will study the affect of acculturation on the IC of the Mishing. "