Where is the subway line 3 in your Beijing Subway Map?

Subway line 3 of this city will be operated in 2018. So you cannot see this line in the map now.
From Tiantan Dongmen to Panjiayuan, you need to take subway line 5 to Songjiazhuang Statiion, then transfer to subway line 10 to Panjiayuan Station. The ticket fare is CNY 4. And it will take around 20 mins on the way.