According to the characteristics of subjectivity

fuzziness and randomicity in subjective trust

the model of trust evaluation based on membership cloud theory was proposed by introducing the theory of membership cloud. The trust cloud and trust grade cloud were described quantificationally

the process of calculation

synthesis and comprehen-sive operation for the trust evaluation cloud was presented

and the evaluation of trust grade was also presented. The re-sults of experiments show that the trust evaluation model proposed is valid.