The Yizhuang Line of the Beijing Subway is a rapid transit line that connects the Yizhuang Development Area with Beijing's subway network. The line is 23.23 km (14.43 mi) long with 14 stations, including six underground and eight elevated. It runs from Songjiazhuang in Fengtai District to Yizhuang Railway Station in Tongzhou District and passes through the southern Chaoyang and northern Daxing Districts. Total investment for the line was estimated at ¥1.2 billion. Construction began on December 8, 2007 and the line opened on December 30, 2010. Yizhuang line's color is magenta.

Tongzhou is a district of Beijing. It is located in southeast Beijing and considered the eastern gateway to the nation's capital. Downtown Tongzhou itself lies around 20 km (12 mi) east of central Beijing, at the northern end of the Grand Canal and at the easternmost end of Chang'an Avenue. The entire district covers an area of 906 km2 (350 sq mi), or 6% of Beijing's total area. It had a population of 673,952 at the 2000 Census, and has seen significant growth and development since then, growing to a population of 1,184,000 at the 2010 Census and 1,840,295 at the 2020 census. The district is subdivided into four subdistricts, ten towns, and one ethnic township.