Abstract: There are a large number of mineral resources hidden in the sea-floor，and the development of seabed resources is helpful for easing the situation of global resource scarcity.The deep-seabed coring drills are major technical equipment for resource exploration，geological survey in seafloor et al.The designed parameters and features of foreign deep-sea coring drills were summarized; The result of actual application and the development trend of foreign Coring drills were analyzed.From the study，many foreign countries have developed sets of deep-seabed Coring drills，and some of them have been used in sea-floor core drilling，but exist some kinds of technical issues.The drill tool and drilling method have been optimized undergoing a hard time，but there are still some problems that coring rate is not stable and generally low.In order to provide powerful reference for developing and improving the deep-sea coring drills of China，it is necessary to research design technology and development experience of foreign drills.

Key words: Deep seabed mining, Coring drills, Design parameters, Application effect