what's most convenient way to Shamian from Beijung road? taxi, bus or train?

You must refer to Beijing Road, don't you? Well, it is within 4.5km between, so the most convenient way should be to take a taxi to reach. Besides, MTR can be fine as well. Walk from Beijing Road to Gongyuanqian MTR Station to take local subway line 1 to Huangsha Station. Get out from Exit D and you can walk to your destination.