Stem sap flow of a plant can indicate water consumption by transpiration and accurately reflect the transpiration of plants and water utilization.In this study,Dynamax sap flow measuring system and automatic weather station system were used to simultaneously measure and monitor sap flow velocity and related environmental factors of the artificial shrub Atraphaxis bracteata in the Mu Us sandy area.Results showed that(1)the diurnal variation of stem sap flow of Atraphaxis bracteata presented a multi-peaked curve.At night,there was still stable flow of low value.The magnitude of sap flow changed considerably between sunny and rainy days.(2)Throughout the growing season,the total sap flow is 428.83 L,with the average daily sap flow of 2.639 5 L/d.(3)The flow rate of Atraphaxis bracteata was positively correlated with some ambient environmental factors.Correlation analysis showed that by the coefficients from correlation analysis,the order of factors was solar radiation air temperature air relative humiditywind speed.