Abstract: The problem facing the plant is that the underflow of the pre-desliming screen is difficult to be handled because of the excessively high density of the underflow and liability of solid particles to settle down. The pre-desliming screen is therefore renovated through the use of polyurethane TP screen deck. Practice shows the use of the polyurethane TP deck can lead to effective elimination of the phenomenon of running-off of water across screen surface, reduction of density of screen underflow and volume of coarser particles passing through screen deck, and decrease of pipe plugging risks. This can not only ensure the smooth operation of subsequent processes, but also bring about a noticeably favorable economic result.