①First prepare the nylon zipper and the fabric that needs to be zipped；

 ② Use a 1.5cm wide seam where the zipper needs to be installed, first dredge the seam, and then iron the seam separately. If you don't need to zipper the entire seam, then the stitch spacing used for the section of the seam that is not zippered should be finer, and the beginning and end positions should be fixed with inverted needles.；

 ③Align the nylon zipper face down with the center of the seam, and use a hand sewing needle to fix it with the seam.；

 ④ Turn the fabric to the front, install a unilateral presser foot for sewing the zipper on the sewing machine, push the presser foot down to the right side of the machine needle, start from the right side of the opening of the nylon zipper, and press a bright thread on the fabric with a 0.7cm seam.；

 ⑤When you have completed the stitching on one side and are ready to sew the other side, first look at the position of the zipper iron under the zipper. If you can avoid it, you can directly turn 90 degrees and let the machine needle go across the top of the zipper to the other side to start stitching. When turning, you should first keep the needle in the lowest position, then lift the presser foot, and then put down the presser foot to continue sewing after turning. When sewing to the top of the zipper teeth, do not step on the electric motor, but turn the sewing machine wheel by hand, so that the needle carefully crosses the nylon zipper teeth, so as to avoid broken needles.；

 ⑥ If the Baokou iron is just in the turning position, then you only have to push the presser foot to the left of the needle and sew an open thread on the left from the opening. Be careful not to forget to rewind the needle at the beginning and end of the crimping. Finally, remove the sparse stitches on the fabric；

 ⑦ For people who are proficient in the car method, there is no need to dredge the seams first, but for novices, it is necessary to take more steps in the production process. Although it is a bit troublesome, it can guarantee satisfactory results.