The wettability of plant leaves,reflects the affinity about the water to leaves,and the water membrane on a leaf has the key influences on photosynthesis and rainfall interception.Contact angles of water were measured for 35 species plants in Shaanxi Province,and the wettability of leaves was researched primarily.Contact angles of adaxial leaves were 0%一14%,with an averaged 85.40°.According to contact angle,the plant species that are non-wettability or repellency with the value more than 95° was 31.4%of total measurements;the species with contact value less than 85° was more than 51%of the total;and there were 17.1%plant with contact angle of 85°-95°,which means that the wettability of the leaves lies between wetness and repellency.For a plant leaf,the wettability on adaxial and reverse leaves was somewhat different.The ratio of cuticle to wax of plant leaf had significance to leaf wettability.The degree of subsidiary hair on a leaf had influence to wettability and the wettability of the leaf became worse along with the subsidiary increased.If the subsidiary hair was rejected,the wettability of leaf would become better.The stoma and vein on the leaf affected the wettability through increasing the roughness of plant leaf.