Hi, Ms Mei. There is only one train from Shanghai to Dalian every day, which will take you 23 hours to be there. I suggest you go by plane, for the air ticket is sometimes much cheaper, similar to the train ticket and the more important is that it will take less time on the way. If you do not have enough time, why choose some bearby cities around Shanghai, such as Suzhou, Hangzhou and Nanjing. Good day~