Based on the existing test methods of multi port device scattering parameters, finds that these standards do not represent the latest testing technology. Some test methods are defined by parameters just to get a simple block diagram, so the operability is not strong. These test methods are leaving the development process of modern radiofrequency instrument. According to the development trend of modern radiofrequency instrument, and combined with mixedmode Sparameters of multiport device definition, poses that using multiport vector network analyzer test multiport scattering parameters, and can be used by data acquisition technique, More than one parameters can be test, it will greatly improve the test efficiency.