Marine Geology Data Access Middleware realizes the mapping of physical model and standardized logic model, realizes the object to relational database mapping. It separates the business logic structure and database storage, suits the distribution application, and provides perfect service for upper layer application. This paper mainly introduces the following contents: Demand analysis for Marine Geology Data Access Middleware, from purpose and function; study overall structure of Middleware of Marine Geology Database Access;design of Marine Geology Data logical model, define data contract, develops the Marine Geology Data Access Middleware based on .NET platform, including mapping between object model and relation model based NHibernate; realizes construction and management of WCF service and distributed data access.%海洋地质数据访问中间件是分布式网络环境中，透明访问异构海洋地质数据资源的工具，通过以数据服务方式封装异构数据源，提供了分布式访问的标准接口；同时实现了对象和关系数据库之间的高效映射，使业务逻辑层与数据存储有效分离。文章介绍了海洋地质数据访问中间件的目标功能、框架结构、面向对象的海洋地质调查数据逻辑模型设计和对象访问的接口契约。同时介绍了实现海洋地质数据访问中间件的关键技术，包括基于NHibernate实现对象关系映射、基于WCF实现数据服务的构建和托管以及分布式数据访问等。
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