1. Use official applications: Many cities' subway systems have their own official applications, which can provide real-time subway schedules, route planning, site information and other services.
2. Online map services: Baidu map, Gaode map and other online map services can also provide subway lines and real-time arrival time information.
3. Social media and message push: Subway systems in some cities may publish real-time subway information on social media or send real-time arrival time notifications to passengers through message push services.
4. Station information screen: In subway stations, there are usually large-screen displays or electronic billboards to display real-time arrival time and line information.
5. Ask the staff: If you are not familiar with the online inquiry method, you can ask the conductor, security inspector or other staff in the subway station for real-time subway information.