The toxic components concentration of the exhaust gas of DF chemical laser in the working environment is analyzed. By applying the Gaussian normal equation of gas diffusion, a gas diffusion model is established under the experimental conditions to calculate the wind speed under different gas concentrations. Based on temporal and spatial distribution of the concentration of pollutants, the sampling points are selected, and the atmospheric sampling of trace fluoride method is developed. The gas under different conditions in different regions are measured. Then the experimental data are analyzed and compared with the national standard. The results show that, after the exhaust gas of DF chemical laser is expelled into the atmosphere, toxic ingredients in their working environment have some residue, but the concentration is in the security permitted range.