Abstract: Through analyzing industrial wastewater treatment technologies and combing fuzzy comprehensive evaluation method with grey comprehensive evaluation method, a new kind of industrial wastewater treatment technology evaluation method, fuzzy and grey integrated evaluation method, was developed. In the new evaluation method, the relational grade of grey comprehensive evaluation was transformed into weight to take the place of the weight calculated by analytical hierarchy process (AHP) in the traditional fuzzy comprehensive evaluation method, which could reduce influences of artificial factors on evaluation results. At the same time, dimensionless processing for original data using the formula was performed to change originally qualitative analysis into quantitative analysis, thus increasing the evaluation result accuracy. The modeling process of the mathematical model of fuzzy and grey integrated evaluation method was provided with an application example analyzed.