Abstract: Poisson regression, combined with generalized additive models (GAM), was used to examine whether there are interactive effects of particulate mass concentration, including TSP (total suspended particulates) and PM₁₀ (thoracic particulate matter), and temperature on non-accidental deaths for the period from 1 January 1998 to 30 June 2000 in Beijing, China. The results show that bigger associative effects on non-accidental deaths existbetween particulate matter and higher temperatures. A 10 μg/m³ increase in ρ(TSP) was associated with an increase of 0.177%, 0.052% and 0.311% in non-accidental deaths at low, moderate, and high temperature layers respectively, which are stratified by the temperatures of 5^th and 95^th percentiles. A 10 μg/m³ increase in ρ(PM₁₀₎ was associated with an increase of 0.090%, 0.185% and 0.568% in non-accidental deaths at low, moderate, and high temperature layers, respectively. The effect of ρ(TSP) and ρ(PM₁₀₎ at the high temperature layer on non-accidental deaths is higher than that at the moderate temperature layer. Theresults of this study suggest that there are interactive effects of particulatematter and high temperature on non-accidental deaths.