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In the precision automatic measurement field and the radio frequency field, the switch system has a wide range of applications. So a high efficiency, anti-interference switch system has important practical value. Ordinary electromagnetic relays are easily influenced by EMI/RFI, at the same time they bring electromagnetic noise to the lines. In the field of precision measurement and RF applications, such relays cause error. So the coaxial switch with good shielding was the best solution. Using G programming language designed the user interface. Based on the LabVIEW platform, through DAQmx hardware driver, coaxial relays were controlled by program to switch and coaxial circuit could automatically turn on or turn off. In the application of coaxial switch system in the programmable capacitor, coaxial switch controlled 23 binary-weighted capacitor elements. Capacitance bridge was used for testing the output value. The result reflected that this coaxial switch based on LabVIEW can switch any capacitor. The interference were reduced, at the same time, the precision and automation of the system were greatly improved.