C2C e-commerce types, divided into auction platform and non-auction platform, social networking and blogs, are non-auction platform sales channels, its not specifically set up for store trading activities while the sales order management are very difficult. Therefore, a method prototype model used in this study, used customized manner to develop a lightweight mobile application sale management system, through a smart phone, sellers can used this mobile application wherever he/her go, to record sales order, and to enhance the convenience and reliability of information. Promoted online store sellers more and more competitive advantage.