Frequency　up-converter　as　an　essential　component　of　the　transmitter,　which　is　used　to　implement　the　frequency　up-conversion　by　mixing　a　low-frequency　intermediate　frequency　(IF)　signal　with　a　local　oscillator　(LO)　signal.　However,　only　the　1st-order　sideband　of　the　LO　signal　and　the　IF　signal　are　used　in　the　tradtioanal　microwave　photonic　up-converser,　thus　the　frequency　of　the　up-conversion　signal　is　omega(LO　)+　omega(IF).　In　this　case,　an　LO　with　a　higher　frequency　is　needed　for　generating　a　high-frequency　up-converted　signal.　In　order　to　reduce　the　frequency　requirement　of　the　LO　signal,　the　high-order　LO　singals　or　secondary　modulation　can　be　used　to　achieve　high-frequency　up-conversion.　A　microwave　photonic　up-converter　with　LO　doubling　based　on　carrier　suppressing　single-sideband　modulation　is　proposed　based　on　the　cascaded　structure　of　a　Mach-Zehnder　modulator　(MZM)　and　a　dual-parallel　Mach-Zehnder　modulator　(DPMZM).　The　MZM　is　driven　by　an　LO　signal　biased　at　the　minimum　transmission　point　for　carrier　suppressing　double-sideband　(CS-DSB)　modulation.　A　fiber　Bragg　grating　(FBG)　is　used　to　separate　the　+1st-order　from　-1st-order　of　the　LO　signal.　The　-1st-order　of　LO　signal　is　then　sent　to　a　DPMZM　for　the　secondary　modulation,　and　the　carrier　suppressing　single-sideband　(CS-SSB)　modulation　is　realized　in　order　to　generate　the　-　1st-order　of　the　IF　signal　by　using　an　electrical　90　degrees　hybrid　coupler.　The　modulated　IF　signal　is　then　combined　with　the　+1st-order　LO　signal　reflected　by　the　FBG　and　sent　into　the　photodetector　(PD)　to　implement　the　photoelectric　detection.　The　upconverted　signal　with　a　frequency　of　2　omega(LO　)+　omega(IF)　can　be　detected　by　a　PD.　The　experimental　results　show　that　the　spur　suppression　ratio　of　the　optical　spectrum　and　the　up-converter　signal　reach　22.5　dB　and　23.6　dB,　respectively.　The　spurious-free　dynamic　range　of　the　system　is　96.1　dB.Hz(2/3).　The　proposed　system　can　effectively　reduce　the　frequency　requirement　of　LO　signal,　and　the　purity　of　the　electrical　spectrum　is　largely　improved　which　benefits　from　the　CS-SSB　modulation.　The　proposed　microwave　photonic　up-converter　provides　an　effective　way　for　high-frequency　emissions　in　systems　such　as　radio-over-fiber　and　optically　controlled　phased　array　radar.