AAC is the shortened form of Autoclaved Aerated Concrete, and ALC is the shorten form of Autoclaved Lightweight Concrete. In fact, the ALC is completely same as AAC. The main materials of AAC panels and blocks are silicon sand, cement, lime, gypsum etc. Reinforced with anti-stain processed steel bar, the concrete panel with many air holes was formed after high-temperature, high-pressure protection with steam. It¡¯s a new type constructional material with excellent functions. There are patents of Germany and Sweden and Japan included in the production equipments. The complete production process, from mixing raw material, anti-stain processing of steel bar, organizing into frame, pouring paste on, cutting, steaming and pressing to surface processing, is calculated accurately with computer program and has a rigid QC control.