Pyohaerokt(漂海錄 - A Record of Drifting across the Sea) is voyage record book which recorded the facts that Choi, Bu(崔博) accidently drifted away to southern china due to stonn Choi, Bu was appointed to a royal inspector to Cheju island District in the reign of king Sungjong(1470~1494) and he was being on the way back to main land to attend his father's funeral. In this record book, the Chinese trade and culture were very precisely explained. It is interesting that this book referred to Choi, Bu's drifting route. ills book also presents an apparent evidence that the drifting route was being used as a maritime way is between Korea and southern part of China The vessel, a private ship made in Cheju Island, was strong enough to endure rough sea travelling. Also sailors of the vessel was a Cheju Island resident who was good at navigation. Due to the sailors' professionalism and the durableness of the vessel, the drifting journey to southern China was made without any severe damages including losing their lives. However, the vessel was so damaged that it could not be operated Therefore they had to voyage without sailing equipment. His drifting voyage explains that Korea could trade with southern China by this maritime route even before the navigation and shipbuilding skills developed enough to sail on the route. By comparing Choi's voyage route with the route mentioned in Koryodokyoung(高麗圖經), there is no major distinction what so ever. As a matter of fact, Pyohaerok is a precious historical record book in that it gave a critical evidence of the main maritime route between Korea and China .