Cuckoo search (CS) algorithm is an emerging approach to solve structural damage detection . By utilizing the modal assurance criteria(MAC)

the objective function of the certain structure is built. Then the CS algorithm is adopted to solve the certian objective function to achieve the damage location and extent of the system. A dual-span beam and a truss are uesd as numerical simulation cases to prove the validity of the CS algorithm. The simulation results show that the CS algorithm is efficient and accurate even under measurement noise.