直接网络数据服务为计算程序提供了一种通过Internet直接访问远程数据的手段 ,它在通讯和计算技术上分别以SOAP协议和Java跨平台计算能力为基础。本文分析了Internet应用技术的现状和发展 ,结合当前数据交换技术和化工数据应用的特点 ,提出了一种新的化工数据应用方法 ,即建立基于Internet的直接网络数据服务的计算模型。实现此计算体系涉及多方面的数据协议和计算技术 ,其中最重要的思想是通过构建一个易用的数据规范框架 ,以简化整个体系的用户使用界面 (包括编程接口和访问语法 )。该框架定义了数据的描述规范、存储规范、查询规范、传输规范和使用规范。该计算模型主要包括 3个部分 ,即服务器端的数据库模型、基于SOAP的数据传输模型和客户端的应用编程接口。该系统以远程程序为数据消费对象 ,最终将实现对数据库透明的访问能力和可扩充的分布服务能力。在此基础上 ,可以进一步发展为分布式计算服务体系 Direct Network Data Services provides a means for computing programs to directly access remote data over the Internet based on the SOAP protocol and Java cross-platform computing capabilities in communications and computing technologies, respectively. This paper analyzes the status quo and development of Internet application technology. Based on the characteristics of current data exchange technology and application of chemical data, a new application method of chemical data is proposed, which is to establish the calculation model of direct network data service based on Internet. Implementing this computing system involves many aspects of data protocols and computing technologies, the most important of which is to simplify the user interface (including programming interfaces and access syntax) throughout the system by building an easy-to-use data specification framework. The framework defines the data description specification, storage specification, query specification, transmission specification and usage specification. The calculation model mainly includes three parts: server-side database model, SOAP-based data transfer model and client application programming interface. The system to remote programs for data consumption object, will eventually achieve transparent access to the database and scalable distribution service capabilities. On this basis, we can further develop the distributed computing service system