In order to promote the self-supplied power plant to participate in the interaction of power grid, a flexible adjustment evaluation method based on the production characteristics of enterprises is proposed. According to the different power consumption of each link in the production process of the enterprise, the production characteristic matrix representing the power circulation relationship is constructed. On this basis, the flexibility of the power consumption system of the self -supplied power plant is analyzed.Equivalent to the power generation and power consumption system of the captive power plant as a whole, two kinds of flexibility evaluation indexes are put forward, including minute level and hour level. Taking the lowest power cost as the goal to solve the optimal unit output and load arrangement, the flexibility adjustment ability of the self -supplied power plant is evaluated. The results present that the method gives the quantitative evaluation results of self-sup-plied power plant regulation capacity, which provides reference for promoting self-supplied power plant and its affiliated enterprises to participate in grid interaction, as well as promotes new energy consumption.