To explore the rheology property in turbulent channel flow of fiber suspensions, the equation of probability distribution function for mean fiber orientation and the equation of Reynolds averaged Navier-Stokes with the term of additional stress resulted from fibers were solved with numerical simulation.The simulation results show that the effect of fibers on turbulent channel flow is equivalent to an additional viscosity.The turbulent velocity profiles of fiber suspension become gradually sharper by increasing the fiber concentration and/or decreasing the Reynolds number.The turbulent kinetic energy will increase with increasing Reynolds, fiber concentration and the aspect ratio of fibers.