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The Chinese distance education through the distance education,radio, television and education stage,with the information technology and network technology development to the main network for distance education of a new generation of distance education mode gradually taking shape.This pattern of breaking the previous mode of space and time constraints,mainly teachers to change the provisions of time and place on medium teaching model,students can freely allocation of time,anywhere,anytime use the Internet to provide long-distance education in all its forms The sharing of resources,to download or video-on-demand, etc.,to find suitable content of study,completed their own study plans and objectives. At the same time reducing the Institute of Distance Education Teaching and management pressure to use more energy to improve the teaching content and methods to update the study and knowledge to improve education quality in terms of saving the school of human,material and financial resources.At this stage,the network used by the Distance Education Centre,the composition of a multi-model C/S or B/S server centralized control model,available through video-on-demand,online courses conducted simultaneously classroom teaching,teachers or students can Server provided by the online classroom,forums, message boards and other forms of communication,at the same time can be downloaded from the website of the relevant teaching resources.However,in this two models under the control,when a large number of users simultaneously access the Internet or multiple users access to various resources,a vulnerable server load is too large,time-delayed response to services such phenomena,which will greatly Impact on teaching and learning activities can proceed smoothly.At the same firm,all the teaching resources must be uploaded to the server through the Internet,with the process of teaching the subjects in-depth and increase teaching resources to increase the total data quickly,servers use the limited space for expansion will increase the number of hardware and increase costs.This issue through P2P technology to create a network teaching system P2P network technology unique to the peer-to-peer technology,students can take full advantage of the client idle CPU,memory,network bandwidth and other resources, distributed under the centralized management model server data traffic,part of the server to download the data received by the task distributed to customers-To reduce the server load and a corresponding increase in efficiency in the use of servers,save resources.The use of P2P technology,teachers or students can build the client sharing resources or resources to download the main nodes,making between teachers and students,between students more convenient communication This will improve the teaching management,improving student learning positive,flexible free.Therefore, the use of P2P technology is to improve the distance-learning network an important technology,the network can promote the teaching of the implementation.Based on four key issues discussed,presented the following solutions:First,teaching subjects varied,the teaching process between the larger differences.The system must be designed to simplify the teaching process,to streamline the functions of teaching modules,to provide a unified module,and various teaching function in the teaching system side of the polymer.Secondly,the teaching content is constantly updated over time without changes,the development of the teaching system is continually updated.Follow the development of modular programming using public libraries and classification procedure templates,reducing the coupling between the procedures,the development of quality assurance and control system development costs.Third,how the complex network environment guarantee stability in the operation of the software.P2P layer of the tree through the establishment of mechanisms,P2P node of the search algorithm,a white board technology,and other technology to meet the high security,high reliability,high efficiency requirements.Fourth,the classroom model of diversity.In the teaching modules to achieve a variety of models to ensure the smooth progress of various scenarios of teaching is the key to the successful implementation of systems.
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