Based on fault measurement requirements, we optimize the automatic measurement program of the space curved surface in some domestic and foreign advanced industries, using computer control technology. Moreover, we complete a quadrangle automatic coordinate entering program and an arbitrary polygon automatic detection program based on DMIS(Dimensional Measuring Interface Specification). In addition, we simulate the fault surface in the central Tarim Basin-26 well area using the above programs and inform two system building methods of 3D-surface morphology detection of faults:The Model Building System Method and The Machine Tool Building System Method. Subsequently, the automatic measuring technique of space surface is applied to the 3D-surface shape measurement of faults. In this way, an automatic detection method for the complex surface of the fault is formed. Thus, the 3D-surface shape of the fault can be measured automatically, and a measurement can be conducted by using multiple angles of view. This allows the boundaries of faults can be fully connected in the traditional fault detection process. This method improves the efficiency and automation degree of fault measurement as well as reduces the human factor and the difficulty of data processing in the measurement process.