本文档对“二手交易平台系统(ExjoySystem)”的软件需求进行分析和解说,使该项目的开发获得上级及相关人员的支持，同时为系统的具体开发的可能性、可行性、必要性提供一定的论据，同时为开发人员进行系统总体规划设计及具体实施开发工程提供必要的参考资料，在系统开发完成后期为系统的测试、验收提供帮助。其编写过程有福州大学计算机专业的学生完成。预期读者是从事该系统开发的相关人员。-This document of "second-hand trading platform system (ExjoySystem)" of the software requirements analysis and explanation, so that the development of the project supervisors and related personnel support system at the same time the possibility of the specific development, feasibility, the need to provide a arguments for the development of personnel at the same time the overall planning system design and implementation of specific