To compare the crack propagation law and production increase mechanism under conventional perforated fracturing and multi-stage perforated fracturing,the physical simulation experiments are independently designed and conducted by preparing artificial cores whose mechanical parameters are close to the real strata, the true triaxial loading method is used to simulate the true three-dimensional ground stress environment.The results of the study indicate that in the case of homogeneous stress in the longitudinal fracturing, the rock starts to crack at the same time as the perforation.The multiple cracks produced expand in the vertical direction simultaneously.The extended cracks will generate local stress around the crack tip and thus interfere with each other.So there will be complex cracks.In the case of multi-stage perforated fracturing, when the first crack exists, the pressure in the seam will change the surrounding stress field,and then change the direction of the local maximum and minimum principal stress.During the second fracturing, the new crack will be affected by the local stress field of the first crack,spread along the new stress direction,and will not coincide with the first crack,causing the trajectory of the space crack to change.Under the same conditions, multi-stage perforated fracturing has a larger crack area than centralized perforation general fracturing.Under the condition of the same construction scale, the more number of perforation subdivisions, the more complex the cracks and the greater the contact area between fractures and reservoirs.For the heterogeneous and low permeability reservoir, multi-stage perforated segmented fracturing technology is recommended.