Trust　quantification　is　an　important　issue　of　dynamic　trust　management.　Trust　is　fuzzy　and　dynamic,　if　exact　math　tools　are　used　to　calculate　trust,　there　is　information　missing　in　the　calculation.　In　this　paper,　we　use　fuzzy　comprehensive　evaluation　method　to　quantify　trust　and　propose　a　trust　quantification　algorithm.　Simulation　results　show　that　the　trust　quantification　algorithm　can　effectively　quantify　trust,　and　an　entity＇s　trust　quantification　value　is　in　accord　with　its　behavior.　©　2010　IEEE.