It is an important line of defense for foreign defense input. Border areas are the first line of defense to prevent and control the epidemic from being imported by land. Border prevention and control has always been an important link related to China's national security. "Border prevention and control" refers to the "prevention" and "control" of related problems in border areas, and carries the tasks of preventing and controlling public health and safety incidents caused by the cross-border spread of major infectious diseases in border areas, and preventing and cracking down on various cross-border criminal activities.