This article aims to study the changes and patterns of China's multilateral diplomacy. Multilateralism has become an essential part of China’s international policy, with Beijing demonstrating much pragmatism in its attitude toward global multilateral institutions. China believes that multilateral diplomacy is a powerful instrument for coping with unipolarity and opposing hegemony. For Beijing, multilateralism will also help to provide new platforms for international cooperation. But there are constraints on China becoming a leading power in global multilateralism.