To provide a method for warp piecing, enabling every yarn of a warp to be pieced more firmly at higher speed than usual.

When piecing a yarn Y10 of a warp 10 with a yarn Y11 of a warp 11, the method of this invention is to superpose one warp 10 on one warp 11 to intertwist them, to size the plural intertwisted warps 10 and 11 and then to blow the compressed air against the surface of sized warps to remove excess size an to dry the sized warps.