Abstract: : In order to improve efficiency and accuracy of HVDC transmission design with mobile office requirement, it is necessary to develop a HVDC transmission design software based on WEB service. The design meets large-scale data storage and interoperation requirement without short coming of existing stand-alone software. Firstly, modules of HVDC transmission design software and logical relationship among them are presented. Then, total software development solution is proposed to present whole business process clearly. Next, by analyzing disadvantages of traditional architecture, a three-tier architecture combined with MVC design pattern is proposed. Finally, framework and development tools used in development process are introduced.Spring MVC framework is used in presentation layer, while Hibernate and MyBatis are adopted in data access layer. Spring framework is used to implement business logic layer and coordinate all sub-frameworks.