A new type of installation for prawn culture is designed and a sub-merged dike provided with net-screen is built on the pond in intertidal zone. Whenthe tide is coming in, sea water can overflow the dike into the pond. The dike cankeep enough water in the pond and the net screen will prevent the prawn fromescaping when the tide is going out. In such a way the sea water in the pond is self-exchanged. Therefore, this installation is very economical, low cost, energy-saving,easy to manage, and high in production. Two completed projects were built and theexcellency of the installation has been proved.