Traveling to China in fall offers beautiful experiences, with comfortable weather, fewer crowds than in summer, and gorgeous autumn foliage. The most glorious thing about being in China in the fall is that you'll find you can spend a great deal of time out of doors and be very comfortable.
If you're coming to China to see the fall foliage, the best thing you can do is head out of the big cities and into nature. Especially, places in Northern China where the climate is more temperate are arguably better, but you can find beautiful autumn colors in many places.