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The lack of trust is one of the most important problems that affect supply chain cooperation. Selecting trustworthy members is an effectual way to solve this problem. Based on this, in this paper, we introduce the idea of trust management in network security and propose a searching model of trustworthy supply chain called TSFM aiming to choose trustworthy supplier in the setting up of supply chain. The model not only gives selection process of suppliers, but also gives the store and update methods of suppliers' information. A calculation method of the expected trust value is also put forward in it. Finally, the simulation experiment results show that this model is feasible and effective.