With the large-scale development of new energy and grid-connected power generation, due to the strong fluctuation characteristics of the output power of renewable energy, coal-fired units need to cooperate with the power grid for power dispatching at any time. With the increase of peak-valley difference of power grid, the peak regulation of thermal power generation units becomes more frequent, and the variation of peak regulation load is larger. Based on the operation data in peak regulation process, the correlation of operation parameters is analyzed, and the correlation of unit data is summarized to improve peak regulation strategy and realize efficient peak regulation. The results show that the unit load is strongly correlated with reheat pressure and regulating pressure, and has a linear positive correlation.