Nowadays，the concentrating solar power（CSP）plant with thermal storage is a new way to utilize solar power.By making full use of large-capacity CSP devices，the CSP system is able to translate the solar power absorbed.Additionally，the CSP generates power via a steam turbo-generator and has fast regulating performance.The operation behavior of CSP is studied from the viewpoint of power grid，based on which its mathematical model for dispatch is developed.The model describes the power flow inside the CSP with its major operation constraints.Furthermore，the model for power system dispatch considering CSP plants is built based on the security-constrained unit commitment problem.It is shown by simulation that CSP，on the premise of its energy being fully accommodated，may bring about considerable benefits to the power system by reducing the generation cost，increasing renewable energy accommodation and enhancing utilization of transmission lines.