how to go from harbin airport to ibis hotel by bus or train? how much also is the fare?

First, you need to take Airport Bus- Railway Station line to the railway station, and then transfer to bus 118. Get off at Renshou Baoxian Gongsi, Daoli Qidao Street. Walk south for 2 minutes along the road and turn left, walk for 1 minute, you will see your hotel. It takes about 1h and CNY21.

so what bus line should i take? and which bus stop should i go down? to ride bus 118?

The line is named as Airport Express and it’s the only express of the airport. You need to take it to the railway and transfer to bus 118 at railway station.