The Spatial distribution of HF(v=4→0) chemiluminescence spectra in the gain medium of a CW HF chemical laser measured on an optical multichannel analyzer (OMA-2). The measurement can be finished in a few Seconds with a spatial resolution of x·y=2.5×10 mm. A detailed discussion is presented on the error caused by the nonuniform sensitivity of the OMA-2 detector. The error of the temperature measurement is found to be ±30 K.