A young man and a woman were captured fighting over the curtain on the D710 high-speed rail from Shanghai to Beijing South on December 13.
The video shows a young man striking the woman's head when she attempted to pull the curtain down.
The man said: "What are you doing? Is this your home?"
The woman replied: "Is this at your home then?"
According to Shanghai railway police, the train staff separated the two commuters and the dispute stopped.