Sea-level rise caused by global warming puts island countries at lower elevations at risk of inundation, resulting in an increase in the number of environmental displaced persons ((EDP)). How to choose a suitable country for EDP to emigrate and protect its unique culture has become an urgent problem to be solved. Therefore, this paper uses the global sea level average height data provided by AVISO+ from 1993 to 2019 to predict the global sea level height in 2050 and compare it with the elevations of the island countries in the world to find out which are "high risk island countries". Secondly, when EDP have to migrate to a new country to survive, they will inevitably face the problem of cultural assimilation, that is, cultural loss. In order to predict the risk of cultural loss in high-risk countries, this paper constructs a risk assessment model of cultural loss in high-risk countries on the basis of ISO/IEC general standards and some commercial standards. A comprehensive evaluation model is used to determine which country EDP should migrate to, while ensuring that the risk of cultural loss is minimized. This paper uses data on greenhouse gas emissions, per capita GDP, virtual variables consistent with the official language of high-risk island countries, and the geographical distance of each country. The study found that the global sea level is rising at a rate of 3.397 millimeters a year. By 2050, Maldives, Tuvalu, Kiribati and the Marshall Islands will not have the conditions for normal human life.