Abstract: At present, addressing climate change and biodiversity conservation are two urgent tasks for the international society; especially with the deepening of the global response to climate change, their relationship becomes closer. However, there are some lags and deficiencies in rule synergy between climate change and biodiversity, which seriously affects climate change and biodiversity conservation actions. Therefore, in the future, in order to realize their rule synergies, the international society should think about system integration, make full use of political force of carbon neutrality consensus, build mutual support principle in international law. For China, biodiversity conservation should be considered under the carbon peak and carbon neutral 1+N policy system. Nature-base climate solutions should be affirmed. Rule conflicts between climate change and biodiversity conversation should be actively prevented.