A risk assessment method of aeroengine compressor disk based on probabilistic damage tolerance is established. The effects of defect occurrence, defect distribution, stress and defect detecting probability on the risk of compressor disk failure are considered. The risk assessment processes with and without considering the inspection are established based on the requirements of the airworthiness regulations and advisory circular. By combining the finite element analysis and the fracture mechanics approach, the changing curve of the compressor disk failure risk versus cycle number is given. The result is compared with that in AC 33.14-1 to test and verify the accuracy and rationality of the developed method.