Modularity is a product design and manufacture method that attracts management scholars since 90s.Based on the understanding systematic character of knowledge, this paper consider that modularity method also can be efficiently used in the KM field. Currently mainstream knowledge creation literature mainly is developed from Nonaka’ SECI model. They pay attention to tacit character of knowledge, and pay no attention to its complexity and systematical character. In fact, knowledge creation depends on the complex cooperation of various kinds of specialized knowledge and the simulation of the creativity of knowledge workers. The main function of modularity is decomposing complex system. Secondly, the creativity of knowledge workers can be inspired by using modularity method .So that, modularity is in favor of enhancing the opportunity of combinative creation, the capability of dealing with uncertainty and rapidity of creation. In the end, this paper presents knowledge management strategies based on such a modularity theory.