The specific steps from Changsha South Railway Station to Xiangya Second Hospital by subway are as follows:

1. Take Rail Transit Line 2 from Changsha South Station (west of Meixi Lake) and get off at Renmin East Road Station after four stops.

2. Then change to Rail Transit Line 6 at the station (in the direction of Xiejiaqiao), and get off at Xiangya Second Hospital Station in Yaoling after three stops (Exit 5).

3. Finally, the Second Xiangya Hospital of Yaoling can reach the Second Xiangya Hospital of Central South University by walking 270 meters to the west.

If you start from other places, you can make a more suitable travel plan by inquiring about subway lines and stations.