Take Metro Line 1.
According to the Gaode map query, the total distance from Tianfu Square to Chengdu South Railway Station is 5.6 kilometers. From Tianfu Square, you can take Metro Line 1 directly to Chengdu South Railway Station, and the whole journey takes 16 minutes.
Chengdu delicacies include: hot and sour tofu pudding, dandan noodles, Erjie diced rabbit, Zhong dumplings, Long Chao Shou, Bobo chicken, three cannons, Kung Pao chicken, Chuan Chuan Xiang, Lai glutinous rice balls, etc.