Abstract: Two-dimensional potential energy surface (PES) of Be-CO complex was calculated with single and double excitation coupled-cluster theory with noniterative treatment of triple excitationsCCSD(T), and in combination with large basis sets. The mixed basis sets, namely augmented correlation-consistent aug-cc-pVQZ for C and O atoms, aug-cc-pCVQZ for Be atom, and an additional (3s3p2d2f1g) set of midbond functions were used. A single global minimum with a depth of -69.21 cm^-1 located at R_e=8.29a₀, θ_e=115.42° is found. And the PES exhibits weak anisotropy. Rovibrational energy level structure of Be-CO complex is investigated. Spectroscopic parameters of the complex are calculated.