A naked woman suffering a mental health episode was punched, kicked, dragged by her hair and pepper-sprayed by two police officers, a court has heard.

Senior constable Nathan Black and constable Timothy John Trautsch made a welfare check on the 48-year-old schizophrenic woman in an industrial area at Emu Plains, in western Sydney on January 22, 2023.

Black, 28, and Trautsch, 30, first talked to the woman - who cannot be named for legal reasons - trying to get her into an ambulance and off to the hospital.

'If you touch me, you are f***ed and I mean f***ed. They're up there watching,' she told the two officers while sitting naked on a grassy curb.

'You don't know about the aliens, do you?'