Automatic storage and retrieval system (AS/RS system) includes racks, stacker cranes, inbound and outbound conveying system, electronic controlling system, material handling equipment and computer monitoring & management system. Combined with advanced technologies such as laser positioning, barcode scanning and RF system, the high bay warehouse can be managed reasonably and automatically with minimum errors and convenient operation. With rapid development of modern storage and logistics industry, ASRS system is being more and more important, and used in various warehouses and logistics & distribution centers.