Abstract: The dynamics of stem sap flow of Abies fabric in Minjiang valley, which were the fundamental to research the hydrological recycle of this standing, were measured using ICT-2000TE based on thermal dissipation method in 2003. The results showed that the sap flow rate exhibited mono-peak patterns during day’s dynamics, and the maximum sap flow rate occurred at 12 or 13 o’clock. The main environmental factors to affect the sap flow rate of A. fabric included solar radiation, air temperature and air relative humidity. T.he correlation analysis indicated that there existed a close correlationship between solar radiation and sap flow rate.