Hi, Unfortunately I am not sure about this, but I am also going to Nanjing in a few months. If you have any information, please let me know how it is! Thanks. I assume there probably isn't much outdoor climbing, but I could be wrong.
With weather and work, I wasn't able to get outdoors like I planned. The climbing gym in Nanjing was closed when I was there, but it's called Dyno climbing gym on the Nanjing Normal University Campus. There is outdoor sport climbing on Purple Mountain, and it looked worth checking out. Goodluck!