Abstract: ObjectiveTo explore method for synthetically evaluating clear degrees of procreative pilot areas,so as to obtain scientific and constant experimental data from every clear room.MethodsTo collect data of 8 guidelines airborne particles, setting microbe, airborne microbe, wind speed, noise, illumination, temperature, opposite humidity about 218 clear rooms in 33 grocery factories, pharmaceutical industries, hospitals and scientific research centers which were tested by Fujian centers of disease control from 1997 to April of 2000.To classify these data in 4 ways:level, category, area and year, analyzed with application of grey related analysis and assessed the quality according to the obtained relativity.ResultsHundred level was the best in all levels,hosptial in all categories,Xiameng in all areas and 2000 in all years.ConclusionGrey related analysis is an accurate and practical method for synthetically evaluation.