The flame chemiluminescence is a good tracer of flame statement. In this study, the characteristics of flame chemiluminescence(OH<SUP>*</SUP>, CH<SUP>*</SUP>, C₂<SUP>*</SUP>) according different measuring locations using photomultiplier(PMT), spectrometer and CCD camera. Measurements are made for OH<SUP>*</SUP>, CH<SUP>*</SUP>, C₂<SUP>*</SUP> radicals in gas & light oil diffusion flames. At turbulent nonpremixed combustion mode, the equivalence ratio is varied. The experimental results showed that measuring location affects the result of flame chemiluminescence.