This paper studied the aggregate fruit and Nut in three species of Platanus，including the diameter of aggregate fruit，the number of nut,and fruit fur for each nut, and aggregate fruit and cell number of fruit fur.The data show that P.acerifolia(Ait.) Willd aggregate fruit was the biggest one, with more fruit fur,nut and cell number comparing to another 2 species. Three components，pectin， cellulose and lignin were obtained in the fruit fur,by extracing with paraffin sections and NaOH.After exposed the mice to the the particle suspension of the fruit fur, the concentration of acid phosphatase(ACP) in BALF increased obviously,while the glutathione\|peroxidase(GSH\|Px) decreased compared with the control group,which indicated that lung cells was damaged,and the oxidation\|antioxidation system in the lung lost the banlanc. The results showed that PM10 particle size of the fruit fur has Inflammation\|Causing Effects in mice.