Abstract: By the active phase change material（PCM） wall, the peakload shifting for electric network can be realized with energy saving and emission reduction. An active PCM wall with low quality water for double conditions of building cooling and heating was constructed by encapsulating PCM in casing pipes. The effects of PCM physical properties of phase change temperature, latent heat, thermal conductivity and arrangements of PCM layers on the surface temperature and heat flux of PCM wall were simulated. The results show that the peak phase change temperatures of PCMs are about 15.0 ℃ and 30.0 ℃ for building cooling and heating, respectively. The increasing of latent heat of PCM is beneficial to the reduction of surface temperature fluctuation and thickness of PCM wall, while the increasing of thermal conductivity of PCM can increase the surface heat flux of PCM wall. When PCMs are arranged with the interval layout of thermal storage PCM and cold storage PCM, the optimal comprehensive thermal performance of PCM wall for double conditions of building cooling and heating can be achieved.