How to transfer G 205 Train (shanghai - nanjing) to K 25 (nanjing - huang shan)?

G205 leaves from Beijing and arrives in Nanjing South at 23:46; K25 leaves from Nanjing Railway Station at 15:40. so you have to stay onvernight in Nanjing city, and coatch K25 to huangshan the next day. As you arrive in Nanjing late, i suggest that you book a hotel near the south railway station. and you can take the subway line 1 from the South railway station to Nanjing Railway Station the next day.

Sorry i mean train nanjing to huangshan number K45 (01.28 - 07.35) not K25...

How we can transfer from nanjing south to nanjing railway station on 00.00

then you have to take a taxi, as the subway line stops at that time. it costs about CNY 60 for one cab. and it takes about 20 minutes to reach the Nanjing railway station from the south railway station.

OK thanks Mars!
Last questions, if we buy ticket online from Indonesia, can we change all train ticket in Shanghai Station (Shanghai to Nanjing, Nanjing to Huangshan) ?

Thanks!

yes, you can. you can have all your ticket printed out all in Shanghai station.