| Along with the development of multimedia and network technology, web-based instruction has been developed and popularized rapidly. So, an important task which need to solve urgently is to construct a new mode of continuing education and studying for life, which is untraditional and not limited to the region and time. Constructism[1] advocates the teaching environment in which learners is the center, and they actively explore, find and construct the meaning from what they have learned. Such environment is just what the network can provide. The wide-range application of network-based class teaching system enables the learners to realize the "constructing study".Based on the comparison of those existing education systems and the analysis of their advantages and disadvantages, this paper puts forward the main function of multimedia platform. On the basis of some characteristics and requests about instruction -on- web system of computer center, the thesis produces the whole plan and subject Database by some technologies about Information System ways and System Modeling technology. It introduces the programming model and system structure. At the same time, it looks into the key technology, several key problems encountered during the development. The system has been applied in the lab instruction and got optimistic results.
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