Abstract: The calculation of baseband shaping and QPSK (Quadrature Phase Shift Keying) modulation in DVB-S channel encoding is implemented by the software. After the serial data of "1" and "0" inputted. the high-frequency modulation signal waveform data file will be generated The arbitrary waveform generator-LW420 will produce the 70 MHz carrier transmission signal in accord with the European telecommunication standard (ETS 300 421). Moreover, this software can also be used to generate the waveform data files of l6QAX 32QW 64QAM and l28QAM.