This book focuses on assessing China's international environment in the Indian Ocean including political, economic and secure environments through examining the characteristics of the international environment in the Indian Ocean. It figures out that there are four new changes and characteristics from the perspective of the current international environment in the Indian Ocean. Firstly, the turmoil in the security situation in the Indian Ocean has not been eased, but also showed signs of deterioration. Secondly, the strategic competition of the major powers in the Indian Ocean region has been exacerbated. Thirdly, the USA will remain the largest contributing variable in the international environment of the Indian Ocean in the future. Fourthly, India, a biggest country in the region, is becoming a major variable affecting the international environmental change in the Indian Ocean. This book also presents a picture of how the changes of great powers' geo-strategic competition in the Indian Ocean affect the development of China's BRI and believes that the Indian Ocean order will be gradually transforming from the American hegemony to the emergence of jointly governance including USA, China and India.