Abstract: In order to meet the demand of electronic reconnaissance system for highly integrated ultra-wideband frequency conversion front-end, a design of ultra-wideband frequency conversion module based on millimeter wave frequency conversion technology and microwave composite substrates technology is introduced. Through system link simulation, key indicator design and optimization of interconnection structure, the module achieved in a size of 57 mm×45 mm×12 mm. The measured results show the receive gain of direct amplification channel is better than 45 dB, the flatness is better than 4 dB, the receive gain of frequency conversion channel is better than 46 dB, the flatness is better than 5 dB. The module meets all the specifications, which has many advantages such as high integration, miniaturization and generalization. It has high engineering application value.