hi. but China's long distance bus system has several advantages.
1. Over years, China has built a sprawling highway network which goes to every part of the country. Some remote regions, particularly in the west, are often inaccessible by train(not to mention plane) or only be reached via aeduous, in direct routes and in these areas, bus become the primary and essential mean of transportation.
2. Tickets are often easier to get than train tickets. Almost all major cities and towns have long distance bus station. Tickets are sold at the bus station and usually need not be booked in advance.