A　triple-frequency　microwave　photonic　link　is　proposed　based　on　a　polarization-multiplexing　dual-parallel　Mach-Zehnder　modulator　(PM-DPMZM).　The　lower　sub-DPMZM　is　biased　at　the　maximum　transmission　point　to　obtain　the　2nd-order　RF　sidebands.　Meanwhile,　the　RF　signal　modulates　the　upper　sub-DPMZM　through　an　electrical　90　degrees　hybrid　coupler.　The　upper　sub-DPMZM　works　at　the　carrier-suppressed　single-sideband　(CS-SSB)　modulation　to　obtain　the　+1st　order　RF　sideband.　An　optical　band　pass　filter　is　used　to　filter　out　the　+2nd-order　RF　sideband,　and　only　the　+1st-order　and　-2nd-order　RF　sidebands　are　output　for　the　frequency　beating　at　a　photodetector　(PD).　The　frequency　triple　signal　of　3　omega(RF)　is　obtained　correspondingly.　The　experimental　link　is　built.　The　results　show　that　the　RF　signal　from　8　to　12　GHz　is　tripled,　and　frequency　tripled　signal　at　24　to　36　GHz　is　acquired.　The　minimal　spur　suppression　ratio　of　triple-frequency　signal　is　20dB.　A　relatively　low-frequency　signal　can　be　used　to　generate　a　high-frequency　signal　with　well　quality　by　this　triple-frequency　link.　The　proposed　method　can　be　applied　in　various　microwave　photonic　transmitting　systems.