The strategic importance of the Indian Ocean has been rapidly increasing and the construction of the “21^st Century Maritime Silk Road” has be upgraded to the level of national foreign policy. In this background，China will need a more clarified Indian Ocean strategy. This article takes the perspective of cooperation security analysis and argues that China should promote the security cooperation of the whole region and safeguard the security of the Maritime Silk Road of the Indian Ocean by participating in the existing multi-lateral cooperation mechanisms of the Indian Ocean，making efforts to create new multi-lateral security cooperation mechanism，joining hands with the main great powers within and outside of the Indian Ocean region，and engaging in uncompetitive cooperation in security. The key of the promotion of the “Belt and Road” strategy is to achieve “policy coordination，facilities connectivity，unimpeded trade，financial integration and people-to-people bonds”. This is also closely related to the sea route security of the Maritime Lifeline of the Indian Ocean which is an important component of our country’s interest in the Indian Ocean. China needs to implement its cooperation security strategy from the following 4 aspects：first we need to actively participate in the existing multi-lateral mechanisms and arrangements of the Indian Ocean region；second，we must try to establish new multi-lateral cooperation mechanisms；third，we must promote the security cooperation of the Indian Ocean through great power cooperation and coordination；and fourth，we should take advantage of the uncompetitive security regions as the first step of cooperation.