Aiming at the features of subjectivity and uncertainty of trust in open network,this paper put forward a new subjective trust evaluation model based on fuzzy theory. This model applied fuzzy theory to calculate results of subjective integrated trust evaluation between nodes. And the model introduced the time factor and a constraint mechanism for dishonest nodes on the calculation of trust,and used the close degree reversing the weight to calculate the integrated trust value,and used fuzzy equivalence relati...