MTR system from hong kong airport to hotel mariot

I am wondering whether you refer to JW Marriott Hotel. If so, you can take Express Train to HK Station. Then walk to Central Station to take Island Line to Admiralty. Get out from exit F and you can walk to your hotel.

The way above may be a little expensive, so you can aslo take shuttle bus no. A11 or E11 to Admiralty Station, Queensway, from which walk to your hotel.