Abstract: In order to study the anisotropy and the change rule of the acoustic emission signal of the prefabricated non through structure specimen, the uniaxial acoustic emission experiment is carried out on the specimen with different dip angles.The results show that the strength of the intact diabase specimen is higher than that of the prefabricated weak specimen, and the uniaxial compressive strength varies with the angle of the weak plane in a U shape, and the compressive strength of the specimen with 45° is the lowest.Under the same stress, the axial strain of the structure specimen with α less than 45° is greater than that of the structure specimen with α more than 45°, while the circumferential strain of the structure specimen with α more than 45° is greater than that of the structure specimen with α less than 45°.Analyze the macro failure of the specimen, when 0°≤α< 45°, the specimen failure surface will form brittle shear failure perpendicular to the weak plane direction; when 45°≤α≤60°, the specimen failure surface will form brittle shear failure perpendicular to the weak plane direction, and the specimen will also break along the weak plane, and the two failure surfaces will form a cross mode; when 60°< α≤90°, the specimen shear failure surface will form a cross mode along the weak plane direction direct failure in the direction of shear force.Through acoustic emission monitoring, the impact rate of the weak specimen is more active than that of the complete specimen when it is loaded; by comparing the micro acoustic emission location of the specimen with the macro specimen failure mode, the temporal and spatial evolution law of the failure mode of the weak plane and shear plane in the rock is well reflected.