This study aims to find the optimal operation and management for tank culture Caulerpa microphysa (sea grape) in the modular plant factory.The best operating conditions for stable and high quality of sea grape production all year round would be find to reduce farming cost, due to the half- year yield and various quality cultured outdoor.The higher growth rate and more controllable culture conditions could be found in the tank culture system for macroalgae. Therefore, the tank culture system is used to produce the edible seaweed.To replace the resources collected in the field and get clean and higher quality products, the tank culture technique of Sarcodia montagneana will be developed.