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In order to make learners share learning data in multi-Web sites, in this paper, based on nested knowledge space model, Web-based collaborative learning coalition is defined, and the shared knowledge space model is put forward, by which the learning data in multi-Web sites can be organized together and formed the shared knowledge space. Each Web site in the coalition is able to customize the shared knowledge space according to its needs, then the nested customized knowledge space is formed in the local site integrated with the local learning data. Furthermore, the management and consistency maintenance strategy for the shared knowledge space and the nested customized knowledge space is proposed. In the end, the Web-based collaborative learning coalition is implemented according to the model and strategy mentioned above, and the application effect shows that the data in multi-Web sites in the coalition is shared and their different needs for learning data are met.