Using a narrow-band tunable KrF excimer laser as a spontaneous vibrational Raman scattering ;SVRS source,spatially-resolved Raman scattering is used to measure the single shot concentrations of all major species ;N₂,O₂,H₂O,CH₄ in methane-air flames.A simple polarization technique and optimal tuning of the narrow-band KrF excimer laser are used for the minimization of OH and O₂ fluorescence interference to improve the precision.Moreover a time-averaged temperature measurement technique is presented to fit the N₂ spectrum to theoretical spectrum,by considering the fact that the Stokes spectrum of N₂ will broden and the peak wavelength will blue-shift when temperature increases.The spectral-fit precision is less than 5% at 1500 K.