Customer Hangzhou comes to Shanghai, which exit should I take to Hongqiao by high-speed train (I need to pick up people, so I need to know which exit).

For the train from Hangzhou to Shanghai, the car in front of the "locomotive" is close to the "north exit" and the car behind the "rear" is close to the "south exit".

From which exit to pick up the person, you can call in advance to see which exit he takes the bus.