Carbonate reservoirs mostly develop fractures. The influence of different fracture occurrences on the characteristics and law of water flooding needs to be studied. Through the core displacement experiment，the water flooding law with different fracture occurrences was explored by using carbonate cores with five types of fracture occurrences. The results show that the core with horizontal through fractures has a three-stage production law，namely，synchronous production stage，near-fracture matrix production stage，and fracture channeling production stage. The water-free period and the high water-cut period are the main oil displacement stages of the core. The core with the through fractures has an early water breakthrough，but its anhydrous oil displacement efficiency and final oil displacement efficiency are low. As the fracture angles decrease，the relative permeability of oil（water）decreases（increases）rapidly. The residual oil saturation and the water phase relative permeability increase，and the two-phase area gradually narrows. Based on the Hagen-Poiseuille equation，the permeability calculation method that only considers fractures in the fractured core was proposed. The problem that the irreducible water saturation is hard to be unified was solved through experiments involving three aspects，and the liquid production increase time of actual fields was given，which provides theoretical guidance for the development of carbonate reservoirs.