Piezoelectrical fiber-optic phase modulator is one of the core devices in the fiber-optic Fourier transform spectrometer measurement system. The output voltage characteristics of piezoelectrical drive control system determine the various performances like linearity,resolution,and dynamic characteristic,which can affect the spectral resolution,measurement speed and system noise,and other parameters of fiber-optic Fourier transform spectrometer measurement system. The application of complex programmable logic device(CPLD),composite high-pressure operation amplifier,single chip microcomputer(SCM),and other advanced electronic technologies can help design piezoelectrical fiber-optic phase modulation control system. Experimental results show that the system with the PZT capacitive load displays the good dynamic characteristics and linearity in the setting frequency range,and satisfies.the piezoelectrical voltage waveform requirements of fiber-optic phase modulation.