For comprehend the relationgship of fracture—karst system， writers discussed the fracture and karstification in the way of tectonic mechanism and nontectonic mechanism，and mainly processed fault control action to fracture，the relationship between fault and karstification，and also the relationship between fracture and karstification research: structuralinduced fracture can provide the pass of transportation of karst materials，and nonstructuralinduced fracture can accelerate the speed of corrosion of karstification．The relationship between fracture and karstification is interrelationship promote．By researching，writers have achieved Objective and systematic understanding of relationship between fracture and karstification，it will be very useful in carbonate reservoir researching and reliable reference in carbonate reservoir model building．