PCM (Phase change material) can be integrated into building envelopes to decrease the building energy consumption, refine the indoor thermal comfort, shift and reduce the peak electricity load due to its relatively large latent heat. However, only when the phase change of PCM occurs can the phase-change heat storage property be played. Therefore, the reasonable selection on the PCM phase-change temperature arrangements directly affect the PCM effect. At present, there always a lack of a relative method to determine the PCM phase-change temperature arrange due to its complexity and too many factors. In this study, the determination method on the PCM phase-change temperature arrange is theoretically researched and proposed on the basis of the traditional wall heat transfer theories. This method couples all affecting factors including wall structure, material properties, outdoor climate conditions, indoor thermal environment and so on. This method can provide some meaningful guides for the selection for the PCM phase-change temperature arrange in the engineering practices.