Informationazition construction is one of necessary conditions for enterprise to participate in international competition, and finance sale software is the important part of informationazition construction. However there are seldom domestic finance sale softwares supporting the finance sale management of small and middle enterprises (SME). Therefore, the paper designed and developed a set of finance sale software system based on flexibility and diversity of SME. The system consists of four function modules: order form module, agent module, operator module and backup module. In detailed, order form module and agent module can provide service for finance sale, operator module is designed for data security, and backup module is helpful to enhance system robustness in order to minimizes the loss even if system breakdown happens.