Investigating the relationships between sapflux density and environmental factors and clarifying the determining factors are crucial for deeply understanding mechanism of environmental controls on transpiration. In this study, sapflux density (Js) of Pinustabuliformis trees,meteorological variables, soil moisture (SMandsoil temperature (Ts)were continuously monitored in Mangshan National Forest Park in the Northwest Beijing, China. The results showed that the factors that mainly affectsJs were varied at different temporal scales. At daily scale,Ts, relative humidity (RH), SM were positively significantly correlated with Js. The relative contributions of Ts, RH and SM were 28.3%, 11.7% and 10.1%. At monthly scale, Ts was also the dominant factor that determine Js and its contribution was 49.7%. The contributions of SM and RH were 7.3% and 6.4%, respectively. At annual scale, RH dominated the temporal variations in Js and its contribution was 93.3%. The results also showed that the controls of environmental factors on Js increased with temporal scaling from short time (day) to longer (month and year).This study would provide basic knowledge on temporal scale transformation of plant transpiration and predication of plant water consumption in the context of climate change.