Abstract: In order to study the variation of mechanical properties of rock-like materials under the influence of prefabricated cracks with different dip angles, rock-like samples were made from river sand, cement, gypsum and other materials, and cracks of different angles were made for the similar rock samples. Uniaxial compression experiments were carried out on samples with different inclination angles to study the variation of mechanical properties. The peak intensity of the specimen with pre-formed cracks increases logarithmically with the the increase dip angle of the fracture. At the same time, the peak strain increases exponentially with the increase dip angle of the fracture. The cumulative count of AE event and the energy intensity of the pre-formed fracture specimens are similar. It is divided into three stages: the compaction initiation stage, the elastic stablity growth stage, and the destruction of the sharp growth stage. And the cumulative count of AE event increases with the increase of the inclination angle, and the energy intensity also increases with the increase of the inclination angle.