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The current situation of detection and repair of domestic natural gas pipeline are introduced. As the crack detection still poses a problem, a measurement and control system based on virtual instrument and EMAT is designed. PXI modular instrument platform is taken as the core of the system and a hardware platform, combined with data acquisition module and motion control module is built. A human–machine interaction software platform is designed based on LabVIEW. Robots can be controlled to move through the pipe, to produce and receive ultrasonic guided waves by the system. With the system’s reliability, expansibility, and user-friendly human machine interaction, the demands of motion control, data collection and processing can be met when the robot is conducting EMAT detecting through the pipe.