A foreign national who plans to apply for a port visa at a port visa authority is required to submit his/her valid passport or any other international travel document, along with relevant supporting documents that evidence the urgent reason(s) for his/her entry into China. Once the visa is issued, he/she may enter China from the port where the visa application is made. As for the supporting documents, a foreigner entering China for urgent business activities, for example, shall submit the inviting party’s invitation letter explaining the business purposes, details of emergency, and main itinerary arrangements, as well as relevant proof of the emergency. For more information, please contact the port visa authority at the intended port of entry.