Abstract: In order to assess objectively the comprehensive cleaning functions of superfine fiber fabrics,testing methods aiming at dust removing rate,sterilization,water absorbance,oil absorbance,fiber falling off and water capillary effect were designed and used respectively in the assessment of cleaning functions of knit fabrics made of superfine fibers.Evaluation system of cleaning functions was created,on the basis of test results mentioned above,by fuzzy mathematics,with which seven kinds of target superfine fiber fabrics were evaluated for their cleaning functions.Results show that the cleaning functions of superfine fiber fabrics is much better than that of cotton fabrics,whereas FBZ fabric ranks the first among the superfine fiber fabrics.Superfine fiber fabrics with similar texture and design exhibit almost the same in cleaning functions.It is feasible and reliable to use the established fuzz mathematics system to evaluate the cleaning functions of superfine fiber fabrics.