5th June, Beijing- China CERT released a Bitcoin Trading Report of May 2017, revealing the top 3 exchanges are still OKCoin, Btcchina and Huobi. However, the report failed to track trade volume of other cryptocurrencies, which has taken over half of the total market share.
China CERT, the National Computer Network Emergency Response Technical Team/Coordination Center of China (known as CNCERT or CNCERT/CC) , was founded in September 2002. It is a non-governmental non-profit cybersecurity technical center and the key coordination team for China’s cybersecurity emergency response community.
http://news.8btc.com/top-3-exchanges-trade-80-of-21-7-billion-yuan-for-bitcoin-in-may