The invention discloses a virtual network mapping model in core elastic optical networks. The model is a constrained global optimization model. Virtual node mapping needs to satisfy a constraint condition that all virtual nodes must be mapped to physical nodes, the virtual nodes in the same virtual network cannot be mapped to the same physical node, and the number of the virtual nodes mapped to the same physical node is not greater than the number of virtual machines on the physical node. According to the virtual network mapping model, through design for problems such as mapping, routing and spectrum allocation of the virtual nodes in the virtual elastic optical networks, the global constrained optimization model is established and a global optimization algorithm is designed for effectively solving the constrained optimization model, so simulation experiments can be carried out in different network topologies, the number of frequency slots and the maximum frequency slot number occupiedin the networks are effectively reduced, the number of the occupied frequency spectrums is minimized, and the maximally occupied frequency slot number is minimized.