Abstract: Turbulent flow in and above plant canopies is of fundamental importance to the understanding of transport processes of momentum,heat and mass between plant.canopies and atmosphere,and to micrometeoroIogy.The Reynolds stress equation model of turbulence has been applied to calculate the turbulence in canopies in this paper.The calculated mean wind velocity profiles.Reynolds stress,turbulent kinetic energy and dissipation of turbulent energy in a corn canopy and a spruce forest are compared with field observed data and with Wilson and Shaw's model.The velocity profiles and Reynolds stress calculated by both models are in good agreement,and the length scale of turbulence appears to be similax.