Abstract: The original Xinghuadukou Group distributed in the vicinity of the Lülin forestry center in the northwest area of Tahe, Heilongjiang, can be correlated in geochemical composition with the Archean greenstone belt, which indicates that the Xinghuadukou Group in the study area is a low grade terrane （volcanic sedimentary basin）. Its Sm Nd model age and single stage evolution age are （1252±28～1463±20） Ma.