Abstract: In order to meet the needs of canal lining for anti-permeability, the fly ash was incorporated into concrete to improve the anti-permeability of rice husk concrete. The influence of the content of fly ash, content of the rice husk and water-cement ration on the anti-permeability of rice husk concrete was analyzed. And the mix ratio of the rice husk concrete with the relative permeability coefficient less than 0.783×10-8 cm/s were achieved by the experiment. The main effects in order were water-cement ratio>content of rice husk>content of fly ash. The relative coefficient of permeability of rice husk concrete showed the parabolic relationship that decreasing first then increasing with the increase of the content of fly ash and rice husk and a linear increase was observed with the water-cement ratio. The results proved that rice husk concrete with fly ash can improve anti-permeability without reduction in the thermal conductivity of concrete.