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The same street of two different road planting configuration was used as experimental samples. The diurnal variation of PM in sunny day and cloudy day was monitored and the influence of the two different road planting configurations on PM concentration in the street was compared. Results indicate that in sunny day the daily changes of air particulate was in "S" form, the lowest concentration was at about 16:00 in the afternoon, and the highest concentration at about 20:00 in the evening. In cloudy weather, the daily fluctuation was in "Ⅴ" form with two peaks and one valley,and the two peaks present at 8:00 in the morning and 18:00 in the evening, the valley appeared at 14:00 in the afternoon.No matter in sunny or cloudy weather, for the air particulate caused by traffic, the sparse configuration of the whole road plantings is more conducive to diffusion of PM than the compact configuration.