Abstract: In order to explore the influence of different fissure dip angles on the characteristics of rock mass failure, we carried out indoor tests on similar simulated specimens. In this study, the rock fissure and joint sliding behavior of fissure specimens containing uniaxial compression were studied experimentally. The tested rock model has a permanent single fissure with 0°, 30°, 45°, 60° and 90° of horizontal inclination. The results show that under uniaxial compression, the strength of the complete specimen is higher than that of the specimen with fissures. The prefabricated fissure dip angle affects the development of fissure. According to the test results, the degree of fissures development ranges from 60°, 45°, 0°, 30° and 90°. The uniaxial compressive strength curves of specimens with different prefabricated fissures are approximately inverted U-shaped, and the angle of prefabricated fissures is between 30° and 45°, which has the greatest influence on specimen strength.