This Article is based on the waterfall model of software development ,according to the mechanism of information management and knowledge-sharing in the virtual community which has been constructed analyze the platform of information management and knowledge-sharing in the virtual community, from functional and technical to explain the platform; on the count of this analysis the paper make the functional design, and build three-tier architecture about the platform of information management and knowledge-sharing in the virtual community, describe teaching modules, exchange and sharing of modules of education system in two pairs of the ER design, the module function design; finally clarify test content for the platform.Software development of waterfalls model[1] essentially is a software development structure, the process have a series of stage sequence, begin from requirement analysis, design, test, setup, to maintenance, each stage generates circulating feedback, if the some stage appears a problem and then return to guarantee the integrality.