Mr. Fanzai,

Take Subway Line 5 at Chongwenmen to Hepingxiqiao Station and then transfer to No.407 Bus to get off at National Olympic Sports Center West Gate Station. Then just walk around 700 meters north and you will see the Bird Nest. After visiting the Bird Nest, you can just walk to the Water Cube. It takes about 15 to 20 minutes. Or you can take No.407 Bus to get off at Beichen Bridge West Station to visit the Water Cube first and then go to the Bird Nest on foot.