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In the large difference in the database, if invasion characteristics exist larger camouflage, invasion of judgment will be difficult to form the basis, intrusion path recovery model can not be established. Sensitivity is proposed based on data mining method of large difference in the database intrusion path recovery method model. Using the method of principal component analysis (invasion of path search large differences in the data path, providing accurate data basis for the establishment of the model, using the sensitivity of the data mining method can detect intrusion path characteristics, thus to establish accurate intrusion path model. Experimental results show that the improved method with a large difference in the database intrusion path recovery, to improve the accuracy of the recovery, so as to ensure the safety of large differences in database.