The policy security system of global climate change adaptation consists of climate change adaptation action plan, safeguard institution, safeguard mechanism, and safeguard legal system. With the increasing emphasis and in-depth research on climate change adaptation, the policy security system construction of global climate change adaptation has become the major material security and spiritual guarantee for the improvement of climate change adaptability. Based on the brief description of global climate change adaptation policies in major regions and countries, including EU, America, Japan, Russia and India, this paper reviews the construction of climate adaptation policy security system in these regions and countries. Finally, good international practices are proposed for strengthening China's climate change adaptation policies.