The purchase-sales-inventory system of supermarket has rich functions, including commodity management, purchasing management, sales management, inventory management and financial management. Commodity management module supports the input, modification and inquiry of commodity information, which facilitates the supermarket to carry out comprehensive management of commodities. The procurement management module realizes the generation, tracking and settlement of purchase orders to ensure the smooth progress of the procurement process. The sales management module supports the entry, delivery and collection of sales orders, and provides sales reports and data analysis functions. The inventory management module realizes real-time monitoring and early warning of inventory, and supports inventory counting and report generation. The financial management module provides accounts receivable and accounts payable management functions to support cost accounting and profit analysis. In addition, the system also supports functions such as data export and report printing, which facilitates data analysis and business decision-making in supermarkets. Through the purchase, sale and inventory system, the supermarket can manage the business more efficiently and improve the operation level.