The Take That singer compared the stage of the ITV talent competition to the Death Star in Star Wars, and said that contestants need to be "ready" for the start of the live shows.
"I call it the Death Star, this building. When you get in there, the lights are spinning, it's like a spaceship," he told Daybreak.
"It isn't like doing a show in a pub; everyone's watching, everyone has an opinion. You've got to be focused, you've got to be ready for it."
Speaking about his Overs team - which features Melanie Masson, Kye Sones and Carolynne Poole - he said he aims to change the "joke" perception that the category has received in past years.
"These guys have had experience, they've been around longer than 16-year-olds.
"In past years it's become a joke category and I want to change that."
Barlow also criticised the annual makeover that contestants receive before performing on the live shows, saying: "I thought they looked worse last year when they had the makeover."
The singer recently stated that Kye Sones has a "classic British voice".
The X Factor continues with its first live show on Saturday, October 6 at 8pm on ITV.
Photo gallery - The X Factor final 12:
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