How to use existing knowledge to promote knowledge communication among team members is critical for a team to complete tasks and improve its core competitiveness. This study builds a model of team knowledge system based on related theories of CAS (Complex Adaptive System) from knowledge management perspective. The model includes attributes, actions and interaction rules of individual agent. The system environment, inputs and outputs are also defined in this study. Then based on the main ideas of computational experiments, this study analyzes a case that how external control influences team performance and verifies the feasibility of computational experiments of team knowledge systems. The managerial implications are discussed at last.