Abstract: To evaluate the environment adaptability of plants,using the Li-6400 photosynthesis measuring system and Ci-203 LAI measurement instrument,we measured the indexes such as daily process of transpiration rate,photosynthesis rate and water utilization efficiency of 7 typical plant species in hilly region,Taihang Mountains in order to study the characteristics of the water utilization.The results show that: 1) The daily process of transpiration rate had single peak for 5 species,Rhus typhina,Platycladus orientalis,Robinia pseudoacacia,Vitex negundo,Ziziphus jujube,and double peak for 2 plant species,Quercus variabilis and Pistacia chinensis.The doublet is related to plants' siesta,which shows its initiative adaption to high temperature and drought.The correlation analysis showed that between the photosynthesis rate and transpiration rate there is a firm relationship for 7 species,and for the shrub,a significant one.2) The W_UE(water utilization efficiencies) were significantly different among 7 plant species,meanwhile the Robinia pseudoacacia has a higher value.The descending order of the average W_UE value was Robinia pseudoacacia,Ziziphus jujube,Quercus variabilis,Pistacia chinensis,Vitex negundo,Rhus typhina,Platycladus orientalis,as for water consumption per hectare,was Quercus variabilis,Rhus typhina,Platycladus orientalis,Pistacia chinensis,Robinia pseudoacacia,Vitex negundo,Ziziphus jujube.3) According to water consumption and water utilization efficiency the tested plants could be divided into 3 types: Quercus variabilis and Ziziphus jujube,belongs to higher water consumption and water utilization efficiency type,Platycladus orientalis,the lower water consumption and water utilization efficiency type;as for Robinia pseudoacacia,the lower water consumption and high water utilization efficiency type,which showed the greatest advantage in water competition among 7 species.