To provide a weaving method for non twisted non sized fabric capable of reducing warp fluffing and thread breakage to a mass-producible level even in a fabric having high warp density and a fabric using a warp having a low single yarn fineness in weaving a fabric using multi-filament yarns imparted an interlace by a non twisted non sized fabric interlace using an air jet loom having auxiliary nozzles.

This method of weaving by the air jet loom having the auxiliary nozzles by using an interlaced multi filaments as the warp, uses the auxiliary nozzles having an outer periphery length b satisfying the following formula to the length a of loops between interlaces. b≥0.5×a (the length a of loops is set as two times of the length of the yarns of the non interlaced part a').