Step 1: You should take the K546/K547 train from Xi 'an to Qiqihar. The train starts from Xi 'an at 11:52, arrives at Yangquan North Station at 22:45, starts at 22:47, and arrives in Harbin at 21:3 the next day. Yangquan-Harbin is 174 kilometers, and the whole journey runs for 22 hours and 43 minutes. The hard seat fare is 21 yuan, the hard berth price is 343/355/367 yuan, and the soft berth fare is 542/566 yuan.

Step 2: It's 548 kilometers from Harbin to Suifenhe, and you can take three trains:

1. K723 (Harbin East-Suifenhe, passing Harbin Station), which starts from Harbin at 21:27 and ends at Suifenhe at 7:33, and runs for 1 hours and 6 minutes. The hard seat fare is 75 yuan.

2, 4192/4194/4195 (Manzhouli-Suifenhe, passing through Harbin East Station), driving from Harbin East Station at 21:18, and arriving at Suifenhe at 6:2, running for 9 hours and 2 minutes, the hard seat fare is 37 yuan, the hard berth fare is 79/82/85 yuan, and the soft berth fare is 126/132.

No.3, No.2,727 (Dalian-Suifenhe, passing Harbin Station), driving from Harbin at 22:58, and arriving at Suifenhe at 9:12, running for 9 hours and 12 minutes, the hard seat fare is 66 yuan, the hard berth fare is 124/129/133 yuan, and the soft berth fare is 196/25 yuan.