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Based on analysis of the implications of knowledge management and knowledge management system (KMS), an architecture of Web knowledge management system based on user model is presented. To realize knowledge sharing and knowledge recommendation, User model is applied the architecture, which describe user's interests, skill and task-relevant information need and is learning by genetic algorithms. The architecture is implemented through three tiers which is data layer, core integration layer and front-end application layer. It was helpful to set up user-centered Web knowledge management system and realize sharing knowledge and recommending task-relevant knowledge among users.