Obtaining in-situ natural gas hydrate reservoir cores through drilling and coring， and conducting pressure transfer and testing to obtain parameters of core physical， chemical， and mechanical properties， is one of the key technical methods for conducting marine natural gas hydrate exploration work. This paper summarizes the relevant data of natural gas hydrate core pressure retaining transfer system at home and abroad， and makes a comprehensive summary from the aspects of working principle， structural characteristics and test application， systematically reviews the research and development status of natural gas hydrate pressure retaining transfer and test system， and compares the typical core pressure retaining transfer and test system at home and abroad from the aspects of compatibility and key parameters. Some suggestions for the research and development of pressure retaining transfer system of natural gas hydrate in China are put forward