This Recommendation Y.CPN-CL-Arch focuses on the aspects of control layer in Computing Power Netwrok (CPN). CPN is standardized in ITU-T by a series of Recommendations including ITU-T Y.2500 which gives terms and definitions of computing power networks, and ITU-T Y.2501 which provides the framework and architecture of the computing power network, etc. This Recommendation specifies the capability requirements and architecture of CPN control layer.