Air-lift reverse circulation drilling is an efficient drilling technique which can be used in deep well drilling in hard rock formation since it is not affected by rock fractures and karst caves with thorough removal of the cuttings. A special continuous coring bit has been developed to carry out continuous coring operations in deep-sea hard rock to improve drilling efficiency and core recovery in deep-sea hard rock； thus， providing a novel coring approach for deep-sea drilling. With studies on the selection of the cone profile， the structure of the core lifter， the optimum design of the passage for the cores and cuttings， etc.， the design of the continuous coring bit was put forward， and the test drill bit was made. The bit has been applied in a geothermal well， with core recovery in limestone and sandstone over 80%， higher than that measured in ocean drilling. The verifying test on land has laid a technical foundation for the further application of this technique in deep-sea core drilling.