Abstract: For cross-border groups, the policies of emigration and immigration have a profound impact. Before cross-border behaviors occur, the impact of the policies of the country of emigration is greater than those of the country of immigration. After cross-border behaviors occur, the opposite is true.The sound policies of the immigrant countries help cross-border groups to realize cross-border behavior. The more attractive the policies of the immigrant country, the stronger the motive for cross-border immigration behaviors. The basic premise of an immigrant country is that the immigration behavior of cross-border groups will bring benefits to the country. With the continuous intensification of the aging problem, Japan has been forced by population pressure to ease the immigration policy of cross-border groups. The immigration of cross-border groups not only brings national benefits to Japan, but also causes potential social crisis.The Japanese government has adopted a multilingual policy to alleviate the negative impact of cross-border groups, stabilize integration, and reduce the mutual exclusion between cross-border groups and their own groups.

Key words: cross-border groups, multilingual policy, multilingual services