Structure of the software radio system and basic theory are discussed and analyzed in this paper. Point out necessity of research the software radio and it's develop foreground, accentuate status of wireless system development, condition of software programmable technology and software develop. The paper introduced application diapason of the software radio and high-tech result of current headway in the international, such as the soft interface, the software BUS and the radio frequency synthesis and so on. To need develop tools and debugging work for software radios, the article given some recommendation. For the moment, also pay attention especially to exist some problems when research to the software radio. In the paper author take notice of application of communication and network; cordially put forward a series of suggestion and appreciation, too. The software radio is a system that it is used of the software to control, digit signal processing mode, to complete simulate wireless signal work state. So, work principle of the software radio and simulate mode consult each other, further give prominence to software programming, it and simulate mode have a lot of difference. Software radio using, it can meet information and culture all of requirement. It has obvious characteristics: It can be programmable completely. Used software to program realizes wireless a lot of advanced and complicated function that software work processes incarnate out full digital format. It is used of the network interface and to easy use program application to extend that work environment of more frequency paragraph and more systems, and encode unification. It has unification secrecy property; equipment upgrade and change type is easy, because it is software main, if change an applying the software, the equipment is renovated immediately.