Abstract: To study the variation of PM_2.5 concentration in scenic recreational plantations and its response to meteorological factors, and to analyze the regulation effect of different stands on PM_2.5 concentration, in the summer, autumn and winter of 2013, PM_2.5 concentration and relevant meteorological factors in four typical scenic recreational plantations (Pinus armandii-Ginkgo biloba mixed plantation, Populus tomentosa-Fraxinus chinensi mixed plantation, Populus tomentosa pure plantation, multiple-species-layered mixed plantation) were simultaneously monitored, in Beijing Olympic Forest Park (the observation was conducted continuously for 28 days). The results showed that the daily variation of PM_2.5 concentration in the four stands didn’t represent a unified pattern at different air pollution levels, but were basically consistent at the same pollution level. When the wind force was 0-2 grade, there was no significant difference among daily average PM_2.5 concentrations \[the average PM_2.5concentration during the observation period (9:00—15:00)\] in the four stands at each pollution level. Stand PM_2.5 concentration was positively correlated to air relative humidity (P<0.01), negatively correlated with air temperature (P<0.05), but uncorrelated with wind speed. Changed percentage of stand PM_2.5 concentration compared to the space varied between -21.4% and 33.2%, and it was negatively correlated with air relative humidity (P<0.05), but not correlated with the wind speed and air temperature. The regulation effects of the four stands on PM_2.5 concentration included both increasing and decreasing effects, and in this study, the critical value of air relative humidity was 67% when this regulation shifted.