The QKDN is expected to be able to provide optimized support for a variety of different QKD services. One of the challenges of the QKDN is to assure the network performance and different QoS/QoE requirements of different application scenarios in an autonomic way. The autonomic capability for QoS in QKDN will support the seamless intelligent decision-making closed loop of monitoring, learning, decision, and action sub-processes. To enable the autonomic QoS assurance in QKDN, this Recommendation specifies an overview, a conceptual model, high-level requirements and functional requirements of autonomic QoS assurance for QKDN.