This paper is based on the application blocks included in enterprise library of Microsoft company as design policy of hydrological application architecture of smart client. We think of using the application blocks that are reusable and extensible open source code as this guide to customize application for offline

smart deployment and update

security

data access

and so on by inserting our own code or modifying source code into expose to extensive point. It can not only achieve maximum reused resource

quicken development speed of design and implement for hydrological application architecture of smart client and improve product quality

but also provide beneficial experience of practice and efficient help for implementing application program.