Controlled reaction between active nitrogen and methylene chloride is performed in a dynamical flow system. The nitrogen is activated by a microwave discharge from an oscillator operating at a frequency of 2450 Mc/s. The spectrum of the N₂ discharge shows the first and second positive systems of N₂, first negative system of N₂⁺ and some atomic lines. The spectrum of the glow produced by the reaction between active nitrogen and methylene chloride shows the red and violet systems of CN and one band of CH at 4312 Å. The intensity variation of a CN band with the partial pressure of CH₂Cl₂ is studied photometrically and the cross section of quenching of excited CN by CH₂Cl₂ is found to be 1.8 × 10^-14 cm².The mass-spectrometric analysis of the gas taken from the region where glow occurs shows HCl as one of the final products of the reaction. The mechanism of the reaction is discussed.