People today are living in the period of globalization, whereby multiculturalism has become an inevitable trend in the majority of countries around the world, including Korea. Under the impact of a series of social issues such as low birth rates and population aging, Korea has been receiving a massive wave of international migrants, including international students, workers and international marriage migrants. Thus, multicultural society is an era trend that cannot be denied or resisted in current Korean society. Facing this trend, the Korean government has continuously made efforts to introduce a system of regimes and policies to build an open and inclusive multicultural society. It can be said that Korea's multicultural policy in general and its policy to support immigrants' social integration in particular have achieved some remarkable achievements, but there are still some limitations. This article focuses on understanding policies to support foreigners on social immigrating to Korea, especially the policies to support immigrants' social integration, thereby assessing the limitations as well as future prospects of that policy system.