During the epidemic from Guiyang North Station to Ziyang North Station, it is necessary to prepare a 48-hour negative nucleic acid certificate. According to the travel epidemic prevention policy, Guiyang and Ziyang will be under normal control by June 25th, 2022. Entry and exit require 48 hours of negative nucleic acid certification, 3 days of inspection outside the province and 48 hours of negative nucleic acid certification within the province.