Planar laser-induced fluorescence (PLIF) is used to measure spatial distributions of the instantaneous temperature field, and to detect the flame front position. The aim of the present study is the experimental investigation of temperature distribution and flame front location in a laminar propane-air premixed flame at atmospheric pressure using OH* PLIF. The equivalence ratio of the laminar premixed propane/air mixture was changed in the range from 0.9 to 1.2 during measurement (the bulk velocity of the mixture was 1.7 m/s). OH radicals was excited in the v' = 1 ← v'' = 0 band of the A-X electronic system at wavelength 283.55 nm and spectrally resolved detected in the (0,0) and (1,1) vibrational bands around 305 - 320 nm.