In her best attempt, she scored 92.50 points.
The second place was taken by Rachel Karker from Canada (88.75), and the top three Chinese woman Li Fanhui closed (86.50).
The victory of Demidova was the first in history for Russians in a halfpipe at the stages of the World Cup.
Earlier it was reported that freestyler Maxim Burov was awarded the title “Honored Master of Sports of Russia”.