Many seafood all-you-can-eat restaurants in Beijing. The revolving restaurant on the top floor of the five-star Xiyuan Hotel near Capital Gymnasm or Beijing Zoo is probably one of the best seafood all-you-can-eat restaurants with nice city view and good food selection. The price is 260 RMB per person and reservation is often not needed.

Try Tairyos Teppanyaki. For 170 rmb at their Gonti Donglu restaurant, you can eat as much seafood, beef and sushi as the heart desires. They also have a branch in the Sanlitun village which is more expensive: S2-32, 3/F, Sanlitun Village, 19 Sanlitun Rd