Abstract: On the background of regional power grid integrated with large-scale wind generation, the peak regulation capacity ability of power grid is an important factor to restrict the integrating of wind power. In this paper, annul data for a real regional power grid is taken as an example to calculate the Pearson correlation coefficient of wind power and typical daily load, and to analyze the characteristics of single wind farm and regional wind power. On the basis of analyzing the characteristics of wind power, peak regulation capacity under different wind power scene is calculated and analyzed, and typical characteristics of regional wind power for calculating peak regulation capacity is chosen. It is suggested from researches that the more reasonable method for calculating peak regulation capacity under the scene of wind power output with the most obvious inverse peak regulation characteristics is presented by considering the correlation of the regional wind power and daily load when there is bigger grid-connected wind power capacity of regional power grid.