In recent years, China has used fishing boats, maritime militias, oceanographic research vessels, and public vessels to carry out its “gray-zone” strategy in the East China Sea, Taiwan Strait, and the South China Sea; such activities include monitoring and harassing the maritime activities of other nations, and have become a threat to the maritime security. Furthermore, China has also raised up pressure by increasing the number of military aircraft and warships in our surrounding waters and airspace, and poses a significant threat towards our sovereignty and security.In purpose of devising countermeasures against China’s maritime “gray-zone” strategy, so as to gradually clarify the strategic implications of the "gray zone" strategy, this research will (a) examine relevant domestic and international cases (b) hold interviews with experts and scholars from both domestic and international spheres (c) conduct a systematic review of existing relevant literature and regulations (d) compile the positions and response of various countries (e) Reviewing the current regulations and response measures. Through findings from above, this research is going to propose relevant regulatory suggestions and concrete strategies as reference for the policy formulation.