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Postal informationization has been promoting rapidly in recent years, almost covering all of the postal businesses. There are over 50 unified national systems of postal applications now, improving business development, service tools, quality of service to a new high level and laying a solid foundation for the postal further rapid development in the coming years.With the ceaseless upgrading of information technology and the rapid growth and expansion of all the postal businesses, to provide customers with more comprehensive, hith quality service, the next generation design of the postal application software systems will gradually be evolving to be centralized, so the postal application software systems will be huger and more complex. To reduce the risk of the postal application software project failure, and to improve project development efficiency and quality, the management and monitoring of the postal application software project must be transformed from the current extensive to more precise and controllable.To push this transformation, this article has researched the precondition of intensive management of the postal application software project, discussed the necessity of the postal application software project measurement, summarized that the basic of software measurement is the size estimation. Only the first establishing a unified, scientific, quantitative model and method of the size estimation of the postal application software project, it is possible to build a common assessment scale for quantitatively and objectively monitoring of the scope, plan, schedule, cost, quality, efficiency and test of the postal application software project. This article is arranged in the order of after the first abstraction concreteness, after the first theory practice. First this article briefly introduces associated concepts and process model of the size estimation of the postal application software project; then according to the current development of information technology, considering that requirement of the openness, security, easy to implement, low cost, this article focuses on the design of the size estimation system of postal application software project including system architecture, function modules, processes, interfaces, and database logic etc; and finally this article explains in detail the implementation of the size estimation system of postal application software project including the functions of size estimate, project management, user management, system configuration and other functions. The size estimation system of postal application software project has offered a good tool to further advance the method and model of the size estimation has application in standardizing the requirements, drowing up the plan, monitoring the cost, evaluating the efficiency and controlling the quality of the postal application software project. Based on the achievements of this article, the size estimation system of postal application software project has a friendly interface, convenient operation, easy to use and the tool has been put into trial operation, met all the requirements for size estimation, won a good reputation and achieved the prospective purpose.
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