Abstract: The tear bomb is a kind of most effective non-lethal riot bomb for dispersing group targets. Especially for explosive tear bomb, its stimulating agent can be released instantaneously to act on living targets rapidly. But in practical tactical application, no correct measure index is for the non-lethal effectiveness of tear bomb, thus leading to no scientific basis for the use of tear bomb. According to the diffusion characteristics of aerosol smoke, the mathematical models of heavy and non-heavy gas diffusions are used. The two models are combined effectively by calculating the virtual source point. The diffusion process of aerosol smoke is analyzed and studied to get the variation laws of diffusion radius and concentration of aerosol smoke. The effective area of single tear bomb is analyzed and calculated, which is considered as the measure index of non-lethal effectiveness of tear bomb. The results show that, when the wind speed is 2 m per second, the effective diffusion area of a tear bomb can be achieved 602.1 m² after 39 s, and the smoke concentration is no less than 1 mg/m³, the calculated results are consistent with the experimental results. Key

Key words: ordnancescienceandtechnology, tearbomb, non-lethalefficiency, analysisandcalculation