Grey literature can be used as a substantial resource in Research & Development but it has trouble to manage. This study aimed at getting a better way to manage the grey literature by grasping the present problems in collecting, organizing and using the grey literature. This research studied the definition, type, and characteristics, usabilities of grey literature from the related materials and it performs the case study on how to manage the grey literature in major institutions. Finally, it suggested management method of various materials through the in-depth interview with the staffs in charge of managing grey literature in government institutes.