Digital tickets are scanned at the park gate for fast-track entry. The charity, which is using technology called Swiftpass, believes it is the first to adopt such a system.
The system will reduce waste from paper tickets. The charity will also save money by selling tickets directly, rather than through third parties, and by reducing postage, printing and distribution costs.
"With the school holidays upon us, the Eden Project is entering its busiest time of the year," said Jon Curry, head of ICT at the charity.
"Swiftpass mobile ticketing will help us relieve the pressures of queuing, and in so doing, greatly improve our overall customer experience."