China will block all sites related to cryptocurrency and ICO transactions, including foreign sites.
Ads on cryptocurrency and ICO disappeared from Baidu and China's Weibo
China applies a variety of controls to ICOs and domestic and foreign crypto trading platforms, including a decision to ban all other related businesses, such as local and foreign crypto trading sites.
This statement is seen as a "knock-out" to completely stamp out the domestic cryptocurrency market.
I think China purpose of banning ICO is just try to create a very strong regulation or maybe they really can't stop ICO and crypto currencies of existing as they will going to end the banning ICO on September here is the link
http://bitcoinist.com/chinese-official-new-regulations-2018-may-end-ico-ban/. I heard before this decision that even there is a halt policy still the Chinese folks are finding ways to elude the policy.