Jianguomen subway station to agricultural exhibition centerstation

Well, you can take bus line 650 from Jianguomen South Station to Chang Hong Qiao Dong Station. The bus ride takes about 20 minutes, and the fare is CNY 2. Then, walk north for about 900 yards to it.

Or, take metro line 1 from Jianguomen to Guomao Station, and change to metro line 10 to it. The metro ride takes about 15 minutes. The fare totals CNY 3.