Oceans occupy 70 percent of the earth's surface with potentially abundant natural resources underneath. These resources hitherto inaccessible are now able to be exploited due to advancing technology. The ability to exploit these potential resources has become a source of friction and dispute between nations so UNCLOS is needed to provide a rule of law and resolve conflicts that arise over these under sea resources. This paper will explain the nature of the current maritime disputes and introduce the principle of joint development as a viable solution to these disputes and will present examples of how the principle of joint development has worked in the past to alleviate maritime disputes. These points will be addressed in the following paragraphs. The research findings are as follows; first, with EEZ and Convention on the Continental Shelf practiced, there would be rules to follow and all activities in the ocean should be subject to the UNCLOS. According to the UNCLOS, coastal nations have rights to claim their EEZ and extend the length of Continental Shelf at least 200 nautical miles to 350 nautical miles which is a reason why it leads to delimitation dispute on waters. Thus, in order to resolve complicated maritime dispute, based on the UNCLOS, there is a good method to deal with them, that is the spirit of “provisional arrangements of a practical nature.” Also, we have learned from cases that disputes on maritime delimitation can be solved and relevant states can cooperate in exploring and exploiting natural resources, where nations in the basis of rational choice are willing to lay aside sovereignty but on the sovereign right to share and use natural resources for each other. That will be a win-win situation.