Concrete structure is the most widely used structure form in civil engineering, and crack is its main damage form. Based on the electro mechanical impedance (EMI) monitoring technique, The experiment was carried out to monitor the crack quantitative development in concrete cubes.The concrete test cubes with size of 150 mm×150 mm×150 mm were prepared,and PZT piezoelectric patches were bonded on the surfaces.An impedance analyzer HP4294A was used to extract the admittance signals of concrete cubes corresponding to healthy condition and several damage conditions,and the relations between them was studied.The results showed that the admittance signals varied with the development of crack in concrete.The peaks of conductance signals and resonance peaks of the coupling system of piezoelectric patches cohesive course main structure could indicate the crack development in concrete cubes,but its stability was poor. Among the traditional damage index,the mean absolute percentage deviation(MAPD) and root mean square deviation(RMSD) were more suitable for monitoring the emerge of crack in concrete than the correlation coefficient deviation(CCD),while CCD was more suitable for the quantitative analysis of crack development than MAPD and RMSD. Besides, some specific values of damage index of crack development in concrete cubes were obtained, it was available for health monitoring application based on EMI.