I will take a trip to China for business. But my mandarin skill is zero. I would like to learn Chinese but looks so difficult for me. Any ideas to get some useful words or phrase with Chinese learning in short time?

For learning Chinese in a short time, I have some advice,you can just learn some conversations that you need it in your business using as some common ones like : "where can I buy the ticket to Shanghai or how to find some hotels in Shanghai?" etc.