In order to investigate the feasibility of using pumice lightweight aggregate concrete as channel lining material, a canal lining board of pumice lightweight aggregate concrete was produced using natural pumice, sand, cement, water, and industrial waste fly ash. The foundation soil temperatures of an unlined canal, a normal concrete-lined canal, and a pumice lightweight aggregate concrete-lined canal were compared. Meanwhile, the morphology characteristics of the normal concrete cross-section and the pumice lightweight aggregate concrete cross-section were compared using image-processing software. The results indicate that the pumice lightweight aggregate concrete lining can effectively slow down the rate of heat exchange between the foundation soil and surrounding environment, inducing that the foundation soil temperature changes slowly throughout the freezing period and foundation soil congelation delays or does not occur. The proportion of the area of visible closed holes of pumice lightweight aggregate concrete to the whole cross-section area is far greater than that of normal concrete in the case of the same amount of air-entraining agent.