The Okinawa General Bureau of Cabinet Office has been performed various environmental investigations to realize coexistence of coral reef and port construction. It should be necessary to utilize the data provided by the investigation effectively. However, there was not a unified guideline by the past investigation. There was the case that an investigation item or precisions were different on each investigation. There was also the grasp of the general comparison and evaluation of the investigated data. Therefore we planed to make unified guideline of investigation methods of coral reef at the port of Okinawa. "The guideline of investigation methods of coral reef at the ports in Okinawa" was published in March 2007.