To go from airport to Muxiyuan Statio at 4pm. Is it faster a taxi or bus+ taxi or train + taxi? thx!

Well, of course the fast way is to take a taxi if you really arrive at 16:00, which is not the afternoon peak time yet. The cab fare is CNY 120 to 130. And it takes around 50 to 60 mins on the way.
Or upon landing, you can take airport shuttle bus line 1 to Sanyuanqiao Station first. The ticket fare is CNY 15 per person. Then transfer to subway line 10 to Dahongmen Station, Exit C2. After arriving, walk north along Nanyuan Road around 0.6 miles.

You can choose the way you like. :-)