Good day, What is the best and safe transport mode to travel from Shanghai to Harbin how many cost if by air and how many cost if by train

There is only one train between and it is K56/K57. The train takes about 31 to 32 hours. The fare is around 463.5 to 496.5RMB per person for hard sleeper.
The flight takes about two hours and a half. For the fare, it is hard to tell, because you will find the discount if you book in advance. The China Eastern Airlines and Southern Airlines have flights operating between and you may go to the official websites for detail information.