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The commodities price is a very important data for shopkeepers of shop online. By using the Web mining can get more and more data in everywhere such as e-supermarkets and e-commerce. Many theories and algorithms are reported for Web mining. This paper shows a case study for the price extracting of mobile phone of shop online. The MVC design model is opted to build the application system. The opened developing tools: PHP language and MySQL database are used to code the system program and construct the system database respectively. The system functions are described in detailed. The functions coded by PHP are designed for implantation the price extracting of mobile phone, comparative analyzing, and system management. Experiment demonstrates its performance and proves price data is meaningful and useful for the shopkeepers selling online.