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To ensure full information transparency and appropriate resource sharing in project-oriented collaborative manufacturing environment, a trust evaluation algorithm was presented in this study. The trust evaluation algorithm is applied in a hybrid access control model, which combines the project-based access control model with the role-based one. The model limits operations of a role in a concrete project to guarantee the confidentiality and the integrality of the collaborative environment. The trust evaluation algorithm was introduced for the resource access of across administration domains in collaborative environment, in order to judge, by the confidence value, whether to the dynamic authorization to users or not. Finally, the architecture was discussed and the simulation experiment to the algorithm was carried on. The result of the simulation experiment matches with the requirements of the application so that the validity of the algorithm was proved.