Sandwich panel walling system is an effective energy saving system, which can realize integration of fireproof, thermal insulation, sound insulation, decoration and walling function. Base on architectural design demand, panels can be horizontal, vertical or inclined installation; meanwhile, allows to combine different thickness and colors to realize both economic and functional aesthetics. Besides, Winsom sandwich panel inserting PVC profiles at both fixing ends not only avoids cold bridge but also increases installation strength. Simple and scientific installation system and double waterproof treatment achieves sealing and waterproofing effect.