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Trust model in optimal resource allocation for a virtual organization is proposed through the use of trust mechanism to improve service satisfaction. In this paper, firstly trust in the model is divided into direct and indirect trust. Trust values are classified according to time period of trust evaluation during computation of direct trust. Therefore, direct trust values are computed by using weight based on the time period. Secondly, a trust network is adopted to compute indirect trust values. Finally, resources are allocated based on overall trust value of each resource allocation chain.