I am from Malaysia. How do i get the bus from station Suzhou to Humble Administrator's Garden (Zhuozheng Yuan).

You start your journey from SZ Railway Station?
If so, it is suggested to take a taxi to reach directly, because there is about 4.5km from the garden and the railway station.
If you want to take the bus, you need to walk to the South Square Station to take the bus line 40 to Beiyuan Xincun Station and then walk to the garden along Dongbei Street.

Tq