i want to go to tianjin from guangzhou by train or by air

Direct airplane between the two cities are available every day and it takes around 3h. The direct trains from Guangzhou to this city takes more than 25h. To save time, I suggest you take a high-speed train at Guangzhou South to Beijing West first and it takes 8-9h. After that, transfer to a train to your destination and the duration is around 1.5h.