超市具有以居民为主要销售对象，采取自选销售方式，结算由设在出口处的收银机统一进行等特点。因此，超市有大量相对固定的顾客群，这一顾客群来超市的购物频率较高，作为超市，应该为顾客提供一个宽松、便利、快捷的购物环境。但是目前在很多大中城市，普遍存在超市购物付款 Supermarkets have the residents as the main sales target, to take the optional sales, settlement by the exit at the cash register uniform and so on. Therefore, the supermarket has a large number of relatively fixed customer base, this customer base to the supermarket to buy a higher frequency, as a supermarket, should provide customers with a relaxed, convenient and efficient shopping environment. However, in many large and medium-sized cities, there is a widespread supermarket shopping payment