pick up my husband at Beijing Airport

Which terminal he will land depends on the airline company.
From the city downtown area, you can go to Xidan to take the airport shuttle bus line 2 or go to the local railway station to take the shuttle bus line 3 to reach the airport directly.
Or you can go to the Dongzhimen Subway Station to take the airport express to reach the airport directly.

i undrestand that i will catch the subway but after i take off in airport express line how i know if it goes to 2 terminal and after taking off from this station what bus i will take what number bus goes 2 terminal my husband landing ar 2 terminal. i want to know what number of bus goes to 2 terminal. Thank u pls be clear Thanx

If you take the Express Train at Dongzhimen, the terminus of the train will be T2. Therefore, no need to worry about that. Just get off at the final stop and walk to meet your husband.

Thank you i appreciate this thank u very much sir