In the occeans worldwide, about 15% deep-sea floor is coverd with polymetallic nodules ( or known as manganese nodules ) containing 76 elements such as manganese, nickel, cobalt and copper. These nodules, undoubtedly, will be an essential natural resource for mankind in the future. Since the 1960's, some developed countries have began researching into the exploitation and utilization of the natural resource. More recently , China also started on research work in the field.In this paper, deep-sea manganese nodule resource is briefly described along with state-of-the-arts of exploition technologies both at home and abroad.