This is a national exhibition! From Beijing Railway Station, take Line 2 to Dongzhimen and transfer to 13 line to Wangjing West and transfer to 15 line under the National Exhibition. This is the most convenient way to get there. Don't leave the station or change to 2 yuan. Remember not to leave the station quickly to save money. Just look at the sign and change to the channel. Ask the staff if you don't know.