The purpose of this paper is to the investigate uniform attractor for the nonautonomous two-dimensional Navier-Stokes equations of viscous incompressible fluid on a bounded domain:
where is the kinematic viscosity of the flow and is the external force. As usually and denote the Hilbert spaces
which are endowed with the scalar products and norms of and respectively. First, the existence and structure of uniform attractors in is proved for equations with normal external forces in . Then, the properties of kernel sections are studied. Finally, the fractal dimension of the kernel sections of the uniform attractor is estimated.