As a novel method of visual inspection,the analysis of bore detecting image plays an important role in the daily fault diagnostic of aeronautic engine.Development of the system of 3D Measurement and stereo reconstruction has of importance to improving the level of fault diagnostic and veracity forecasting,decreasing the devotion of manpower and material and saving the cost of maintenance.In this paper,applying the clue of whole system frame,the basic idea and arithmetic of developing the module block are presented,including collection of image,demarcating the cameras,preprocessing image,stereo matching,3D measurement,depth reconstruction and so on.Partial achievements are presented.Development of the system establishes an important foudation to implement the expert system of fault inspection and diagnostic of aeronautic engine based on borescopic image.