The future trends of international migration present three major characteristics：（1） the number of international immigrants continues to increase，but the proportion to the total population changes little；（2） the number of illegal international immigrants remains stable，with the situation of illegal immigration in developed countries being expected to ease；（3） the international refugees’ issue will become more prominent，making the mechanisms of refugee protection and governance the focus of attention of the international community.In terms of national security，the impact of international migration is mainly reflected in three aspects：homeland security，public security，and cultural security.The impact of international migration on national security is actual and objective；it also has subjectively constructed components.In this regard，it is necessary to establish a proper understanding of international migration，construct a scientific migration policy system，and give full play to the complementary effects of national governance，regional governance and global governance，so as to achieve safe，regular，orderly and circular cross-border migration.