A method for controlling a skew angle of a ski slope at skiing facilities wherein said skiing facilities have a ski slope floor for holding artificial snow, said ski slope floor has a movable ski slope floor in a part along a width direction, and a cover member is provided under said ski slope floor to cover a gap generated between said movable ski slope floor and said ski slope floor when said movable slope floor is driven, said method comprising the steps of:
- (a) driving said movable ski slope floor to said ski slope floor in up and down directions;
- (b) covering the gap generated between said movable ski slope floor and said ski slope floor using said cover member;
- and
- (c) supplying artificial snow onto the surfaces of said ski slope floor, said movable ski slope, and said cover member.