A new method for hyperfine spectrum measurement is mentioned and experimentally demonstrated. Ultra-high-resolution spectrometry is obtained through incorporating a two-dimensional (2-D) dispersing CCD spectrometer and a tunable Fabry- Perot (F- P) filter and the spectral resolution of the 2- D dispersing CCD spectrometer is better than that of the tunable F-P filter. The F-P scanning interferometer covers a wavelength range of 780~840 nm with a free spectral range (FSR) of 3.75 GHz and a fineness of 100. With the use of 2- D dispersing CCD spectrometer consisting of a virtually-imaged phased-array (VIPA) and a diffraction grating, realtime high- resolution spectral measurement has been realized in a wide spectral range. Resolution as high as 0.7 GHz obtained with the 2-D dispersing CCD spectrometer in a spectral range of 17.4 nm (792~809.4 nm), is higher than that of the tunable F- P filter. By combining the 2- D spectrometer with a tunable F- P based scanning interferometer, hyperfine spectral resolution higher than 37.5 MHz is achieved. The laser spectrum of the modelocked Ti:sapphire laser is measured with the spectrometer, proving that its longitudinal mode with the spacing of 76.3 MHz can be distinguished clearly.