Abstract: Debris-flow disasters are frequent and serious in China. Drainage channels play a key role in the prevention of debris flows; however, there are still many damaged channels under the impact and abrasion of debris flows. The impact and abrasion seriously affect the safe operation of drainage channels. Therefore, the impact and abrasion of drainage channels is one of the crucial technicalities in debris flow mitigation. To improve the impact and wear resistance of concrete, two measures were adopted:(1)compounding different materials(nano silicon dioxide, micro silicon powder, polypropylene fiber, and air-entraining agent) and (2)coating a polyurea protective layer on the concrete. To this end, the abrasion experiments using the underwater steel ball method were used to study parameters such as impact and abrasion strength, abrasion rate, abrasion coefficient, and average abrasion depth of the two kinds of concrete specimens, and to make a comprehensive comparison of their impact and abrasion resistance performance. The results show that both measures can improve the impact and abrasion resistance of concrete. The impact and abrasion strength of polyurea is about 5-18 times higher than that of the composite concrete, the abrasion rate and abrasion coefficient are both reduced by about 78% ~98%, the average abrasion depth is reduced by one order of magnitude, and the impact and abrasion resistance of elastic polyurea is much greater than that of rigid polyurea. It is considered that the compound mixing material mainly enhances the impact and abrasion resistance by increasing the contact area between aggregate and cement stone, improving the microstructure within the concrete, and enhancing the adhesion. The polyurea material, on the other hand, relies on its own large number of hydrogen bond breakage-neonatal cycles, the relaxation deformation of highly active chain segments, and the adhesive layer of free radical oxidation reactions to significantly improve the abrasion resistance. Therefore, it is recommended to give priority to the application of a polyurea protective layer to prolong the life of debris-flow drainage channels.