Acoustic emission is a method widely used for real time monitoring of the structural condition of materials. In this paper, the uniaxial compression tests will be carried out to acquire the correlation between the characteristics of acoustic emission signals and that of the concrete strength parameter. In the fracture process of concrete, acoustic emission, which is detected by the sensors, is generated when part of the strain energy stored in the samples is rapidly released. In order to analyze the results of experiments better, the acoustic emission event rate and the strain curve are applied. The results show that the concrete strength has an important impact on acoustic emission signals: for low-strength concrete, the acoustic emission event rate columns of fracture process are divided into six stages, and display a clear "bimodal" distribution, but such phenomenon does not appear in high-strength concrete.