It happened on January 22 inside the Feng Hong Mini Market on the 2100 block of South 10th Street.
The man was captured on surveillance walking into the store at 9 p.m. and pointing a handgun at two employees behind the counter.
After demanding cash, the robber fled the scene south on 10th Street towards Jackson Street.
VIDEO: Click here to watch the surveillance video
There were no injuries reported during this robbery.
The suspect is described as a male of unknown race, 5'8" tall with a medium build. He was wearing a dark colored mask, dark colored hooded sweatshirt, black jacket, grey sweatpants and gloves.
If you see this suspect do not approach him, contact 911 immediately.
Anyone with information on this robbery is asked to call police at 215.686.TIPS (8477) or text a tip to PPD TIP or 773847.
Tips will remain confidential.