The oyster culture site is located at the nearshore of Tainan city where it not only has an abundance of phytoplankton for feeding oysters but also has suitable water temperature for growing oysters. Each year the harvest of oyster has brought a good fortune to local fishermen and their household, therefore raising oyster is a very important industry for the Tainan city. Up to the present, the land-based fishery has many difficult problems such as the increasing cost of feed, over pumping of groundwater and lack of efficient treatments for fish diseases. All these difficult situations have given the offshore oyster culture a great opportunity to develop since no feed cost is required and if clean offshore sites are selected for growing oysters. This paper focuses on the problems met in the growing process including oyster raft engineering, biotechnology, marine environmental monitoring and the hygiene problems etc. Finally, several suggestions of oyster value improvement have been provided for the fishermen.