Yimin is Manchu language, the last name of a Manchu branch tribe in the past. Yimin River is a tributary of the Hailar River, originating from the north of the mushroom mountain in Daxinganling, flowing from south to north, crossing the Ewenki Autonomous Banner, passing through Hailar District, and entering the Hailar River under the Beishan Mountain in Hailar District.