The traditional composite target source is a system integration of two independent modules,including a microwave signal source and an infrared signal source,which has the problems of high cost and complex structure.In order to solve the above problems,a hybrid device for generating microwave signal and in frared signal using beat frequency and modulation technology is proposed in this paper.The high frequency microwave signal with different repetitive frequency and pulse width can be obtained by loading different modulation information on t he optical signal through the arbitrary waveform generator combined with the opt ical heterodyne method.The infrared signal can be generated by laser signal thr ough laser signal and infrared signal conversion module.Compared with the tradi tional composite target source is the system integration of two independent modu les of infrared target source and microwave target source,the microwave signal and infrared signal can be generated in the same structure in this paper.And on e of the modulation methods has been used as an example to discuss the generatio n of 9.69GHz microwave signal with modulation information,and the generation of infrared signal with a temperature of 230℃.Furthermore,the structure is mainl y composed of optical fiber devices,which has the advantages of simple structure ,low cost and strong anti-interference ability.