"特许经营权合约" can be translated into English as "franchise agreement" or "franchise contract".
"Franchise agreement" is a commonly used term in business and legal contexts, referring to the formal contract between a franchisor (the party granting the franchise) and a franchisee (the party receiving the franchise) that outlines the terms and conditions of the franchise relationship.
"Franchise contract" carries a similar meaning and is also acceptable, though "franchise agreement" is more prevalent in practice.