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Based on HRTEM studies,the domain structure and the copper vacancy model of Dongxiang low-djurleite are discussed. The HRTEM images show: (i) The domain structures are the intergrowth between djurleit (dj) and digenite (dg) on nm scale. Although there is a transition area which appears as hexagonal-chalcocite-like structure between them,they still follow orientation relationship of (100)dj//(111)dg. (ii) 1.56%-3.12% vacancies of Cu are pre-sent in low-djurleite. There are 1-2 Cu vacancies averagely in every b0 /2 of the unit cell. This ratio is coincident to the composition of djurleite (Cu1.93-1.97S).