The government of Taiwan has opened up to the cross-strait exchanges with China for well over 20 years. Since the inception of the exchanges, many senior (ROC army) veterans returning to China for family reunions have decided to settle down there for good, while others have opted to get married and bring their spouses back to Taiwan. Warily looked upon, these cross-strait marriages are viewed by relevant Taiwanese authorities from a perspective of crime prevention. Yet, blood is thicker than water. Marriages are naturally followed by a whole series of civilian exchanges including visits to Taiwan by friends and relatives from China for getting together, visiting the sick and attending funerals. Additionally, the swelling number of illegal immigration has indeed remained high and placed the police authorities under immense pressure. Therefore, the government officials met with their Mainland counterparts to sign the Kinmen Agreement to establish institutional cross-strait mechanisms to repatriate criminal offenders and illegal immigrants. On the other hand, responding to the vigorous cross-strait trade, the government has also expanded the exchanges to include visits by professionals and businessmen from China, reflecting the recognition of the undeniable reality of the ever more important part China plays in Taiwan’s international market. Finally, lifting travel restrictions on Mainland tourists increases the momentum of the cross-strait civilian exchanges. However, to deal with the ensuing challenges to ensure Taiwan’s best security and interest, and at the same time to maintain the smooth cross-strait civilian exchanges, rely on relevant authorities to carry out the government policy on the legal and operational aspects. And only on a solid and secure foundation can the policy of exchanges remain sustainable into the future. Therefore, this article provides ideas and proposals on various aspects of security practice for reference.