A silver nanowires (AgNWs)/ZnO:Al (AZO) bilayer coating was coated on glass substrates at room temperature by using a polyol method and radio frequency magnetron sputtering, respectively. The microstructure, optical, electrical properties and environmental stability of the AgNWs/AZO bilayer and AZO single layer were investigated. The bilayer structures of AgNWs/AZO annealed at 250 °C could lead to an enhancement of the electrical properties and environmental stability. The sheet resistance of AgNWs/AZO bilayer decreased to 9.8 Ω/sq and the degradation percent of the sheet resistance also decreased to 20.2 % after damp heat testing for 30 days compared to AZO films with the sheet resistance of 24 Ω/sq and degradation percent of the sheet resistance of 102 %. The network distribution of AgNWs on AZO films with the columnar grain structures mitigated the negative effect of grain boundaries, which was considered to be the reason of the improvement in conductivity and environmental stability.