The submillimeter-wave source is one of the most crucial components in submillimeter-wave applications.However,it is expensive to produce submillimeter-wave signals within the electric domain.Pho togenerated submillimeter-wave signal can reduce the cost significantly,which is widely researched at home and overseas.A scheme base d on two cascaded sets of paralleled polarization modulators to generate 32-times freque ncy submillimeter-wave signals is proposed.Firstly,two subsystems of four parallele d polarization modulators are cascaded to produce optical signals which are mainly retained the optical signals of the carrier and ±16th-order sideband signal.Thirdly,the carrier can be suppressed by an optical phase shifter and an optical splitter.Finally,the submillimeter-w ave signal with frequency 32-tupling is generated after signals are beaten by the photodetector .The principle of producing 32-times frequency submillimeter-wave signals is theoretically an alyzed.The ±16th-order optical sideband suppression ratio is derived as 55.7 dB and the r adio frequency stray suppression ratio obtained from the experiment is 43.7dB.According to t h e above theory, a system was designed using photon-simulation software.The OSSR and RFSSR valu es are 54dB and 43dB respectively,which is consistent with the theoretical analysis.Mean while,the effects of phase offset and modulation index,and splitting ratio deviation on s uppression ratio are analyzed.