China can't control bitcoin, it is freely tradable so any people can just buy it.
BTW, I heard that CIA or FBI has a big chunk of it, as they are kinda involved in the beginning... which is scary.
You must not follow the news on coindesk or some other sources of bitcoin news. China is holding more than 50% of the mining pool, as well as the amount of Bitcoin in the world. In general, they are controlling Bitcoin, and the most dangerous thing is that they can open a 51 attack any time they want.