How can I go to Ikea by bus from Youyi south road and tajiang road, Tianjin?

There is no direct public bus that can take you to the IKEA. You need to transfer.
If from South Youyi Road, take bus no. 636 at Meijiang Convention and Exhibition Center Station, and get off at South Hotel Road (Binguan Nandao) Station. Then walk to TJ Museum Station, and take bus no. 835 to Dongli Xinye Square. After arriving, walk to the destination directly.

And do you refer to Tianjiang Road? If yes, take bus no. 871 at Danjiangli Station, and go to Daguangming Bridge Station. Then take light railway line 9 to Dongli Development Zones. After arriving, walk to IKEA directly.