M401, being rectangle shape, is a stone tomb with four steps in the south, and three outer stone coffins on the barrow, coffin nails N rings and earrings were found here.

• M401为阶坛石圹积石墓,平面呈长方形,墓葬南部为四级阶坛,顶部有石圹3个,圹内出有棺钉、棺环、金耳饰等。