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This paper designs and achieves the TACAN excitation source using software radio technique, based on the testing need of TACAN(Tactical Air Navigation)system. Firstly, this paper introduces the principle of TACAN navigation, including:the principle of direction finding and ranging. Secondly, the demand analysis is given combined with signal character analysis. Then the general design, hardware structure constitution and software module design are finished based on the former analysis, and a software radio platform—USRP N210 is chosen as hardware application platform. Thirdly,the detail design for each signal module is completed and programed on GNU Radio. Finally, the experiment platform for signal simulation system testing is constructed, and each signal module is verified on the platform, as well as the function of TACAN signal simulation system.