Howe to get to China?

How to get to China?There are big cities such as Beijing, Shanghai, Guangzhou, Chongqing, Chengdu, Hong Kong etc. where you can take flight to China easily.
Particularly there are many international flights to Beijing, Shanghai, Guangzhou and Hong Kong.
You can also take interantional trains from Hanoi to Nanning, from Moscow to Beijing, Ulaanbaatar to Beijing, Alma Ata to Urumqi, Astana to Beijing.
You can take cruise from Japan to Shanghai, Hong Kong to Guangzhou etc.