According to existing problems in the automatic metering software for radio testing instruments, this paper presents an engineering solution which metrological verification program and user interface were developed separately based on TestCenter. Meanwhile, the problem of model extending was solved with configuration file of XML format. The automatic metering system software built by design idea above can be used to measure 7 types of radio testing instruments accurately and can be used for new type of instrument through the spare interface, not only can increase openness, reusability and efficiency of development, but also make the system expand and update more convenient. This automatic metering system has been well applied in many metering stations of nation.