The explosion took place in an apartment on the ground floor of a building at Zuojiazhuangbeili community in Chaoyang District, said the city's fire-fighting authorities.
Rescuers found an injured elderly woman during a search at the site and sent her to a nearby hospital where she died.
The injured have been sent to the hospital, with one person in serious condition but no life-threatening injuries, state-run Xinhua news agency reported.
There is no information yet on what caused the explosion.