Abstract: On the basis of investigating on data of the street trees in urban area of Zunyi city, the distribution patterns and species diversity of the street trees in Zunyi city were analyzed. The results were as follows: (1) There were 23 tree species along the streets, and the number of six kinds of street trees amount to 85.54%, the total biodiversity index was 0. 924; (2)The average diameter was low, the trees with the diameter lower than 10 cm were 47%; (3)The total biomass of street tree was 1 500 t, which was equal to about 18.9 hm2 forest, and the total leaf area was about 1 018.67×103 m2.