Investigating the effects of mixed application of biochar and polyacrylamide (PAM) on water infiltration and evaporation of coal gangue matrix can provide a basis for the regulation of soil moisture in coal gangue mountain in mining area. The water retention capability, infiltration and evaporation characteristics of coal gangue matrix with different ratios of coal gangue to soil (1:2, 1:1 and 2:1) under the mixed application of different proportion of biochar (1%, 2% and 4%) and PAM (0.5‰ and 1‰) were studied by using a simulated soil column method. The results indicated that:(1) The influence of biochar on the infiltration performance of coal gangue matrix was greater than that of PAM and ratio of coal gangue to soil.With the rate of biochar addition increased, the saturated water content and infiltration rate of matrix increased. Whereas the rate of PAM addition increased, the saturated water content and infiltration rate of coal gangue matrix declined. (2) The cumulative evaporation of with addition of 1‰ PAM was lower than that of 0.5‰ PAM.The effects of ratio of coal gangue to soil on moisture evaporation of coal gangue matrix were greater than that of biochar and PAM. (3) Cluster analysis showed that the water retention capacity and infiltration rate of coal gangue matrix were high under the mixed addition of 4% biochar and 0.5‰ PAM, while the mixed application of 2% biochar and 1‰ PAM could weaken soil water evaporation when the ratio of coal gangue and soil was 2:1. In a word, increasing the addition of biochar would be beneficial to the water infiltration and increasing the proportion of PAM could restrain the evaporation of water in coal gangue matrix.