what will be the train fare(up-down) from Guangzhou to great wall of china?

It depends on what kind of trains you take. If you take T trains, a hart seat costs CNY 251. A hard berth costs CNY456 and a soft berth costs CNY 784. If you take G trains, the first class seat costs CNY 1380 while the second class one costs CNY 862. it takes around 22 hours by T trains, and 10 hours by G trains.

Please be noted that the prices above are for a single trip.