A woman was repeatedly punched in the head on a bus in Melbourne's CBD last month after asking a man to remove his feet from her seat, police say.

The woman, 20, from Footscray, was on a route 220 bus from Sunshine to the city when another passenger put his feet on her seat about 10.30am on March 12.

She asked the man to remove his feet, police say, before he stood up and punched her in the head repeatedly while the bus was driving down Footscray Road.

The man got off the bus at the intersection of Dudley Street and Wurundjeri Way in Docklands.

The woman had minor injuries.