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A new energy-saving type of air supply system named multi-fan air supply system for textile workshop is proposed in authors' preliminary work. There are four factors which effect greatest and are concerned by most designer and operators. These factors are: width of the main air duct, distance between two exports, entrance velocity, relative pressure of export 2. Combined with engineering practice, main factors of this new type air supply system are researched through CFD simulation software and the theory of statistics. CFD simulation is applied by four factors and three levels method to search the optimal value. Then CFD simulation is carry through by single factor experiment of the orthogonal experimental research. Specially, influence of inlet velocity is analyzed in detail. This research can provide technology direction for textile multi-fan air supply system.