The Optical Transport Network (OTN) is a protocol for sending network messaging over optical fiber networks. Intelligent optical networks provide an ideal solution for high-bandwidth services. Currently, data encryption schemes for OTN typically rely on mathematical problems such as elliptic curve cryptography or discrete logarithms, which are vulnerable to attacks by quantum computers. This paper investigates a quantum-secure OTN Framework that integrates Quantum Key Distribution (QKD) and Post-Quantum Cryptography (PQC) technologies, enabling OTN leased lines to resist quantum attacks. This framework can provide users with highly secure quantum-encrypted OTN leased lines services.