Legal basis: Article 1 of the Measures for Issuing Health Certificates in An: All foreigners and people returning to An, regardless of the mode of transportation, need to register as citizens of An after entering Xi! Before leaving the airport, railway station, high-speed railway station, long-distance passenger station or entering Xi through the checkpoint, please prepare your ID card in advance and call up your personal QR code on your mobile phone for the police to scan and review.