Abstract: Taking 33 landscaping tree species in Hohhot as test materials, the leaf water capacity, leaf dust retention, leaf carbon, nitrogen and phosphorus content were measured, the relevant eco-environmental functions of the leaves of main landscaping tree species in Hohhot were studied, in order to provide reference for the selection of landscaping tree species in arid and semi-arid cities.The results showed that, 1) there were significant differences in various ecological functions of leaves of different tree species.The range of leaf water holding capacity was 0.06-1.42 g·g^-1,the lowest was Robinia pseudoacacia cv.idaho and the highest was Cotoneaster acutifolius;the range of dust retention capacity of leaves was 1.54-29.70 g·kg^-1 the lowest was Larix gmelinii and the highest was Pinus tabuliformis;the nitrogen content in leaves ranged from 6.68 g·kg^-1 to 34.40 g·kg^-1,the lowest was Betula platyphylla Suk and the highest was Robinia pseudoacacia;the phosphorus content in leaves ranged from 0.03 g·kg^-1 to 0.36 g·kg^-1,the lowest was Acer L.and the highest was Sabina vulgaris;the organic carbon content of leaves ranged from 358.11 g·kg^-1to 645.42 g·kg^-1,the lowest was Tamarix ramosissima,and the highest was Quercus wutaishansea.2) Generally, the water holding capacity of broad-leaved trees was stronger, while the dust holding capacity of coniferous trees was stronger than that of broad-leaved trees.The nitrogen content of Leguminous trees was the highest, the phosphorus content of Sabina vulgaris,Swida alba and Salix babylonica was the highest, the organic carbon content of Quercus wutaishansea and Sabina vulgaris was the strongest, and the comprehensive functions of Sabina vulgaris,Quercus wutaishansea,Xanthoceras sorbifolium Bunge, Pinus tabulaeformis and Pinus sylvestris were the most prominent.3) The water holding capacity was negatively correlated with other functions, but the dust holding capacity was positively correlated with other functions, the contents of nitrogen and phosphorus were positively correlated, and negatively correlated with the content of organic carbon.