What bus I should take from Baiyun Airport to Malaysia Embassy in Guangzhou?

Oh, the embassy is located at no.233 North Tianhe Road.
Upon landing, you can take shuttle bus line 6, get off at Citic Plaza. The buses are available from 07:00 to 02:00 next day at intervals of around 20 mins. After arriving, walk southeast around 100 yards to find the destination.