How I will get the great wall fron Nanning?

There are many sections of Great Wall, but all of them are far from Nanning. Well, I recommend Badaling ot Mutianyu Section to you, both of which are in Beijing area.

From Nanning to beijing, you can take a direct plane to reach. Then upon your arrival at PEK, the airport shuttle bus line 2 or Express Train can take you to Dongzhimen. Then at Dongzhimen Outer, you can take bus no. 867 to Mutianyu directly ina round 2.5h.

To Badaling, when you arrive at Dongzhimen, take the local suwbay line 2 to Jishuitan Station, from which walk to Daeshengmen where you can take bus no. 919 or 880 to Badaling directly.