This article summarized the results of the Project "Research to find technology and installation solutions of tactical communication system between the Spratly Islands", the Project belongs to the National Important Program of Maritime Science and Technology, coded KC.09/06-10, tested and accepted 11/2010. Based on the actual needs of the Navy, group explored, researched and proposed a feasible plan to install, deploy and test some new features of the system. Some test results and field surveys are also presented for illustration. Products of the subject is put into use for the Navy in the Spratly Islands.