what is the distance between shenzhen and shanghai and what modes of travel are best

It's 1045 miles (1682 kilometers) by train and 835 miles (1343 kilometers) by plane. It takes 12 (high speed trains) to 18 hours (ordinary trains) by train and 2 hours and 15 minutes by plane. If you want to save your time, you should take plane to fly from Shenzhen to Shanghai.