The invention discloses a leno and gauze weave with the weight of 18-19.5 g/m<2>, and further discloses a weaving method. The method includes the steps of warping, jacquard setting up and weaving, wherein warping is conducted through a single-warp shaft; during weaving, crossing warp and ground warp change the position each time after twisting is conducted, and the number ratio of the crossing warp to the ground warp in a twist group is 1:1. According to the leno and gauze weave, by adopting 110 dtex polyethylene fiber as warp and 220 dtex polyethylene fiber as weft, with the aid of the new weaving method, the leno and gauze weave with the warp breakage strength of 1070.58 N/5 cm, the weft breakage strength of 1108.36 N/5 cm and the weight of 18-19.5 g/m<2> can be woven.