Abstract: This research investigated two kinds of fine particles（PM1.0, PM2.5）in the atmosphere and meteorological factors （air temperature，relative humidity, wind speed, light intensity and atmospheric pressure）by using the SIDEPAKAM510 and the handheld weather instrument named Kestrel 4500 at Heilongjiang Forest Botanical Garden. The typical weather was chosen to analyze the relationship between the fine particles mass concentration and main meteorological factors in four different structures of green space. The results indicated that: In the 8:00－18:00 observation period, the concentration of two kinds of fine particles in the green land was high in the morning and low in the afternoon. High peak concentration in 8:00－10:00, trough value appears in 14:00－16:00. The different structure of green space has obvious effect on the reduction of fine particles, the mean concentration of fine particles in each community structure is: arbor- shrub -grass compound land > arbor-grass land > grassland > shrub -grassland. the ability of reducing fine particulate matter in the coniferous forest dominated by Larix gmelinii was stronger than that in the broad-leaved forest dominated by Betula platyphylla. Among the meteorological factors, there was a negative correlation between temperature and wind velocity and the concentration of fine particles in the air. The relative humidity and atmospheric pressure were positively correlated with the concentration of fine particles in the atmosphere.