normal condition warehouses are designed for storage and turnover of conventional goods which are relatively insensitive to temperature. in the process, the efficiency of loading and unloading should be improved as far as possible to avoid the influence of bad weather. in addition, with the rapid progress of e-commerce in recent years, the logistics industry has ushered in unprecedented opportunities of development. in the meanwhile, efficient logistics process is greatly expected for modern logistics industry. besides ensuring basic handling conditions and keep good quality of goods, it is also very important to improve the speed of loading/unloading, sorting and distribution of goods.