Objective : The study was performed to investigate prescriptions, herbal drugs, how to make of external ointment treatment in "Dongeuibogam". Method : I will try to find out external ointment treatment in "Dongeuibogam" using a word, Go(膏). Result : 1. The external ointment has been widely used medical diseases as well as sugical diseases. 2. The same prescription name to have different information was written by other people. 3. Various kinds of medicinal herbs, minerals, anlmals were used and type of oil or juice was used to dissolve these. 4. Methods to make the external ointment were to grind medicines or melt medicine. 5. The external ointment was used to put in eyes or to push into wound and rubed the skin. Conclusion : Go(膏) In "Dongeuibogam" are external ointment treatment when they are used at skin. However, they are used as internal medicine in other side so we might be careful to use Go(膏) for medicine.