The electrochemical impedance spectroscopy was used to study the hydration process of different cement stabilized crushed stone structures under different cement content.The electrochemical parameters obtained by the quasi-Randles type equivalent circuit model are used to analyze the cement hydration evolution law of the material.The research shows that the impedance curves of different structures have the same changing law under different cement content.With the increase of age and cement content, the impedance parameters Rs and Rct continue to increase.The fractal dimensions ds and d, which characterize the microstructure characteristics of materials, show a decreasing trend.The porosity of the material continues to decrease, gradually forming a dense structure.Since most of the suspended dense structure is fine aggregate, too much fine aggregate will spread the skeleton structure formed by the coarse aggregate, and the structure formed by the material is looser. Compared with the dense skeleton structure, the total porosity is higher.