Is the panda house inside Beijing Zoo open for visiting on 8 Feb 2016 to 12 Feb 2016 ?

Yes, it still opens at that time. You can go and see.
About the transportation, you can take subway line 10 at Shilihe Station, get off at Jiaomen West Station. Then transfer to subway line 4 to Zoo Station, Exit A. After arriving, walk northeast around 230 yards (210 meters) to find the destination. The whole way takes around 40 mins. It costs CNY 5 per person.