Unlike flights and trains in China, bus tickets tend to have more availability, giving you the flexibility to change your itinerary at a moment’s notice. You don't need to bought a bus ticket earlier than a day in advance.  Chinese buses often run at a higher frequency than flights in China or trains. Most of the time you don’t have to worry about booking in advance because there will be a bus between two cities that runs at least once every hour, if not more. Compared to Chinese airports and train stations, security at a bus station is a breeze.