Abstract: An integrated assessment index system was built reasonably for job environment quality in workshop, including condition of illumination, color, microclimate, noise and atmosphere. The index was classified according to the hygienic standards for industrial plant design and ergonomics or how the environment affects humans in working, and the weight of index was determined by genetic algorithm and projection pursuit. A kind of integrated assessment is presented, i.e., MODMIIM (multiple objective decision-making ideal interval method), of which the date hierarchy and relevant formula are given, and it has been applied to the assessment of job environment quality in a workshop of a company in Shenyang. The result indicated that the assessment index system and its applications can evaluate comprehensively and scientifically the job environment quality and provide a guidance for many companies to improve that in their workshops.