Honesty is the basic character of science and technology personnel.Credit evaluation is the basic means of scientific and technological credit.Aimed at the demand for credit evaluation of undertaking unit of the projects,project leader,evaluation experts and evaluation agencies in scientific activities,a multilayer fuzzy evaluation model is put forward,in which hierarchical index system of scientific and technological credit evaluation,options set,separatelayer weighting coefficient vector and other fuzzy evaluation parameters are established.Case study shows that based on complicated scientific and technological credit evaluation system,this scientific and technological credit evaluation of multilayer fuzzy evaluation gives quantitative evaluation avoiding human factors and partiality in evaluation process,and provides powerful support for decisionmaking.