【正文】 dedicated network, a small area in the network ambience and through dedicated server between LAN provides connectivity and data exchange services. B/S based on wide area networks, and need not be a dedicated network hardware environment, such as telephone access, rental equipment, information themselves, there are more than C/S greater scope to adapt the general as long as the operating system and browser on the line. (2) On the safety requirements are different: C/S for the general user base is relatively fixed on a strong information security control. Usually highly confidential information systems by C/S structure appropriate, can be B / S part of the publicly released information. B/S based on over wide area networks, the relatively weak control of the securityoriented user base is unknown. (3) On the procedural framework for different: C/S program can pay more attention to process, multilevel permissions can check on the system speed can be considered less. B/S on the security and access speed of the multiple considerations, based on the basis of need for more optimized. Than the C/S have higher requirements, B/S structure, procedural framework is the development trend, from the MS39。s application software architecture. (1) Comparison of data security. As the C/S structure, the data distribution software, the client fires, robbery, earthquake, viruses, hackers and so the data has bee terrible killer. In addition, for grouplevel offsite software applications, C/S structure of the software must be installed on multiple servers around, and synchronize data between multiple servers. Thus, the data for each data point affects the security of data security throughout the application. Therefore, largescale application of grouplevel terms, C/S structure of the security software is unacceptable. For the B/S structure software terms, due to its headquarters in the data set stored in the database server, the client does not save any business data and database connection information, what data need not be synchronized, so these security problems will naturally does not exist . (2) The data consistency. In the C/S structure software solutions, the large group for remote operation, they used throughout the installation of regionallevel servers, and then data synchronization model. These servers must be synchronized every day pleted, the headquarters before the final data. As the local network failure can`t made individual database synchronization does not say, even if sync up, the server is not a point in time data, the data can never be the same, can`t be used for decision making. For the B / S structure software terms, the data is stored centrally, and each occurrence of a client business documents directly into the central database, there is no data consistency problems.(3) Comparison of data in real time. In the grouplevel applications in, C/S structure can`t occur at any time to see the current business situation, that are after the data。 If it is remote, only you can make special network server connection, remote maintenance, upgrades and sharing. Therefore, clients have bee increasingly thin, while the server getting fat is the future direction of information the mainstream of development. In the future, software upgrades and maintenance will bee easier, but will bee increasingly simple to use, which users of manpower, material resources, time, cost savings are obvious, amazing. Therefore, maintaining and upgrading the way the revolution is thin client, fat server. (2) Cost reduction, greater selection. We all know that windows on the desktop puter, almost dominating the world, the browser has bee a standard configuration, but not in the server operating system, windows at the absolute dominance. The trend now is that any use of B/S structure of application management software, just install the Linux server can be, and safe. Therefore, the choice of server operating systems are many, regardless of the operating system that can be selected so that most people use windows as a desktop software or affected, which makes the most popular Linux operating system free of the rapid development of up, Linux in addition to outside of the operating system is free, and even the database is free, and this choice is very popular. For example, many people every day, Sina network, just install the browser can, and do not need to know, Sina What is the server operating system used, and in fact most sites do not use the windows operating system, But the user39。s security certification (such as the CA certificate), they don`t need of people39。天津科技大學外文資料翻譯天津科技大學本科生畢業(yè)設計（論文）外文翻譯學 院 計算機科學與信息工程學院 專 業(yè) 　　 計算機科學與技術 題 目