Abstract: The primary frequency regulation performance of conventional units is a fundamental condition for frequency safety in the power system, and its assessment is one of the important tasks to ensure the operational safety of the power system. At present, there is a high failure rate of primary frequency regulation in thermal power units, which faces serious assessment pressure. In response to this issue, the joint participation of fire storage in primary frequency regulation is researched, and a joint frequency regulation control strategy is designed to ensure that the unit operation can meet the assessment requirements. Firstly, Combined the two detailed rules issued by the regional regulatory bureaus of China's Energy Administration, the essence of the assessment requirements for primary frequency regulation of thermal power units is analyzed; meanwhile, with the goal of meeting the assessment requirements, a joint primary frequency regulation scheme for thermal power unit configuration fast response energy storage and control strategy are proposed. The core parameters of the control strategy are determined based on the historical data of the actual operation of the unit. Case analysis shows that the implementation of this control strategy can greatly improve the qualification rate of primary frequency regulation assessment for thermal power units, and has good performance and engineering application value.