According to the fact that Software radio has wide application vista in aspect of military use and civil use, this paper details the key to technology of Software radio,which is open bus architecture, high capacity linked structure, high speed digital signal processing(DSP), wideband analog digital converter(ADC), digital down converter(DDC) and so on. It recommends the industrial standard of Software radio(MMITS), long-range plan of national defense on 21th century and Software agreement. It summarizes some new advancement of the architecture,appliance and techical standards that Software radio has got for recent several years.