The capacity of renewable energy grid connected is expanding year by year. A high proportion of renewable energy will challenge the operational stability of power system. Firstly, the invoking cost of flexible resource is analyzed. Therefore, the optimized scheduling method for high proportion of renewable energy should be studied. The dynamic optimal scheduling model of renewable electricity accommodation is proposed and solved with the algorithm of dynamic optimal power flow. Finally, the dispatch method proposed is verified by the IEEE 39 bus network. The results show that the accommodation electricity of renewable energy and the safe operation level of power system can be improved through the response of flexible resources.