In　this　paper,　general　theory　of　Fourier-transform　spectrometer　and　polarization　interferometer　is　presented.　A　new　design　is　proposed　for　Fourier-transform　spectrometer　based　on　polarization　interferometer　with　Wollaston　prisms　and　linear　CCD.　Firstly,　measured　light　is　changed　into　linear　polarization　light　by　polarization　plate.　And　then　the　light　can　be　split　into　ordinary　and　extraordinary　lights　by　going　through　one　Wollaston　prism.　At　last,　after　going　through　another　Wollaston　prism　and　analyzer,　interfering　fringes　can　be　formed　on　linear　CCD　behind　the　analyzer.　The　linear　CCD　is　driven　by　CPLD　to　output　amplitude　of　interfering　fringes　and　synchronous　signals　of　frames　and　pixels　respectively.　DSP　is　used　to　collect　interference　pattern　signals　from　CCD　and　the　digital　data　of　interfering　fringes　are　processed　by　using　2048-point-FFT.　Finally,　optical　spectrum　of　measured　light　can　be　display　on　LCD　connected　to　DSP　with　RS232.　The　spectrometer　will　possess　the　features　of　firmness,　portability　and　the　ability　of　real-time　analyzing.　The　work　will　provide　a　convenient　and　significant　foundation　for　application　of　more　high　accuracy　of　Fourier-transform　spectrometer.