To prevent the generation of a weaving bar caused by deformation of a weft yarn weft-inserted just before a missed yarn.

This method for preventing a weaving bar generation in a loom is provided by slowly reverse-rotating the loom by a loom-controlling computer Co upon the generation of an insertion mistake so as to remove the missed yarn. After removing the missed yarn, by operating a starting switch 30 on, the delivering control device C1 reverse-rotates a delivering motor 11 by a prescribed amount, and also a winding control device reverse-rotates a winding motor by a prescribed amount. By these reverse rotations, the cloth fell W1 after removing the missed yarn, retreats more than the original weave front position. Then, a loom-driving motor performs a rotation for a blank beating, and a reed 16 blank-beats the cloth fell W1.