can any one tel me the exact way to pearl markit by bus or sub way from mercure hotel downtown in Beijing?

You can walk from the hotel to Jiulongshan bus stop to take bus no. 715 to Ciqikou West stop. Then walk to Ciqikou metro station to take local subway line 5 to Tiantan Dongmen (East Gate of Temple of Heaven) station. After that, get out from exit B and you can easily walk to the market.