【正文】 ion that shows and handles data , as the requirement of customer end is a client puter it is fat very high. The customer of Browser/Server holds the access that not takes the responsibility for database again and the etc. task of plex data calculation, need it only show , the powerful role that has played server fully is so large to have reduced the requirement for customer end, customer end bee very thin . System is flexible: The 3 minutes of the system of Client/Server, in modular, have the part that need to change to want relation to the change of other modular, make system very difficult upgrading. The 3 minutes of the system of Browser/Server modular relative independence, in which a part of modular change, other modular does not get influence, it is very easy that system improve to bee, and can form the system with much better performance with the product of different manufacturer. Ensure systematic safety: In the system of Client/Server, directly join with database server because of client puter, user can very easily change the data on server, can not guarantee systematic safety. The system of Browser/Server has increased a level of Web server between client puter and database server , makes two not to be directly linked again, client puter can not be directly controled for database, prevent user efficiently invade illegally. The architecture of Browser/Server of threelayer has the advantage that a lot of traditional architectures of Client/Server does not have , and is close to have bined the technology of Inter/Intra, is that the tendency of technical development tends to , it application system tape into one brandnew develop times. From this us option the configuration of B/S the architecture that develops as system. what are C/S with B/S For C/S with the technology of B/S develop change know , first,must make it clear that 3 problems. (1) What is the structure of C/S. C/S ( Client/Server ) structure, the server structure and client puter that all know well. It is software systematic architecture, through it can hold hardware environment fully using two advantage, realize task reasonable distribution to Client end and Server end , have reduced systematic munication expense. Now, the most systems of application software are the two levels of structure of the form of Client/Server , are developing to the Web application of distribution type since current software application is systematic, Web and the application of Client/Server can carry out same business handling , apply different modular to share logic assembly。s management software statistics of law case is typical C / S architecture management software. (2) What is the structure of B/S. B/S ( Browser/Server ) structure browser and server structure. It is along with the technology of Inter spring up , it is for the structure of improvement or a kind of change of the structure of C/S. Under this kind of structure, user working interface is to realize through WWW browser, lose the logic of general affairs very much in front( Browser) realization, but the major logic of general affairs in server end( Server) realization, form the threelayer claimed 3tier structure. So, have simplified customer end puter load greatly , have alleviated system to defend workload and the cost with upgrading , have reduced the overall cost of user ( TCO ). With present technology see , local area work the work application that establishes the structure of B/S , and under the pattern of Inter/Intra, database application is easy to hold relatively , cost also is lower. It is that oneness goes to the development of position , can realize different people, never same place, with difference receive the way of entering ( for example LAN, WAN, Inter/Intra etc.) visit and operate mon database。 Moreover platform architecture the file that also goes to today from past single user development/server ( F/S ) system and client puter/server ( C/S ) system and browser/server (B/S) system. The parison of C/S and B/S C/S and B/S is the now world two technologies of main stream of developing pattern technical configuration. C/S is that American Borland pany researches and develop most early, B/S is that American Microsoft researches and develop. Now this two technologies with quilt world countries grasp , it is many that domestic pany produce article with C/S and the technical development of B/S. This two technologies have the certain market share of self , is with customer crowd , each domestic enterprise says that own management software configuration technical function is powerful, advanced, convenient , the customer group that can lift , have a crowd scholar ink guest to shake flag self cry out , advertisement flies all over the sky , may be called benevolent to see kernel, sage sees wisdom C/S configures inferior position and the advantage of software (1) Application server operation data load is light paratively. The database application of the most simple architecture of C/S is bee by two partial groups, customer applies program and database server program. Both can be called as proscenium program and the program of backstage supporter respectively. The machine of operation database server program is also called as application server. Once server program had been started , waits the request concerning responding customer program hair at any time。 If need differently only, server connection specially , realize longrange maintenance and upgrading and share. So client puter more and more thin , and server more and more fat is the direction of main stream of future informative development. In the future, software upgrading and maintenance will be more and more easy , and use can more and more simple, this is for user manpower , material resources, time and cost save is obvious ,