提出了一种基于.NET 的电力负荷预测系统总体架构，并对本系统的需求分析、整体架构和安全性设计进行了阐述。按照软件工程规范的要求，详细设计了系统各功能模块：负荷分析、负荷预测、数据接收与上报管理、考核管理、数据查询与报表管理、系统维护等六个模块。重点阐述了系统实现的关键技术，如NetAdvantage 组件、XML Web Service 技术和负荷数据读取实现。关键词：负荷预测；.NET 框架；NetAdvantage 组件Abstract: A structure of power load forecasting system based on .NET is proposed. Therequirement analysis, overall structure and security design are also described. In accordance with the requirements of software engineering specifications, System functional modules are designed in detail as follows, load analysis, load forecasting, data receiving and reporting management, checking management, data query and statement management, system maintenance. The key technologies in system are described, such as NetAdvantage Component, XML Web Service and the Implementation for reading load data.Key words: Load Forecasting, .NET Framework, NetAdvantage Component