A　frequency-quadruple　microwave　signal　method　based　on　dual-parallel　Mach-Zehnder　modulator　(DPMZM)　was　proposed.　The　frequency-quadruple　principle　was　theoretically　analyzed.　The　upper　sub-MZM　of　the　DPMZM　was　modulated　by　RF　signal　and　operated　at　the　maximum　transmission　point　(MATP),　while　only　an　optical　carrier　was　obtained　from　the　bottom　sub-MZM　of　the　DPMZM.　Then　the　DPMZM　worked　at　the　carrier-suppressed　even-order　sideband　modulation　mode.　In　order　to　improve　the　purity　of　quadruple　frequency　signal,　optical　bandpass　filter　(OBPF)　was　used　to　remove　the　high-order　spurious　sideband.　Microwave　photonic　frequency-quadruple　system　was　built　based　on　DPMZM,　and　its　performance　was　tested　experimentally.　The　results　demonstrate　that　the　optical　sideband　suppression　ratio　(OSSR)　and　radio　frequency　spurious　suppression　ratio(RFSSR)　can　reach　21.09　dB　and　28.41　dB,　respectively.　Since　no　extra　electronic　devices　were　used,　the　system　can　generate　radio　frequency　with　frequency　up　to　80　GHz.　DPMZM　based　microwave　photonic　frequency-quadruple　system　had　the　advantages　of　simple　structure,　convenient　operation　and　good　frequency-quadruple　performance,　which　can　realize　high　purity　and　high　frequency　quadruple　frequency　generation.　©　2018,　Editorial　Board　of　Journal　of　Infrared　and　Laser　Engineering.　All　right　reserved.