A scheme of single sideband vector millimeter wave signal generation a nd transmission based on double parallel Mach-Zehnder modulators (DP-MZM) is proposed.Unde r the joint simulation environment of MATLAB and VPI,the generation and transmi ssion performance of different modulation formats in 90 GHz band are analyzed.In the simulation,when the DP-MZM works in the optic al carrier suppression (OCS) mode,the single sideband signals of the two submodulator s driven by small signal superimpose each other without the use of filters,the center carrier can be completely suppressed.The results show that the bit error rate (BER) of each modulation signal can reach the hard decision forward error correc tion (HD-FEC) threshold.The error performance of the quadrature amplitude modulation sig nal after probability shaping is obviously better than that of the uniform quadrature am plitude modulation signal,and the power gain of the 7 bit/symbol probility shaping 256 quadrature ampl itude modulation (PS-256QAM) signal after systematic transmission is the most obvious,the p ower gain of 2.94 dB is increased after transmission of 50 km optical fibers.Comp ared with the existing schemes of carrier supresion millimeter wave,the system has the advantages of simple structur e,high adjustability and obvious signal transmission gain,so it has certain ap plication value.