Most of the children's seats are placed in the car seats and are fixed with a slanted shoulder strap (sometimes with a belt). However, cars of different models have different seats, seat belts and fixed methods. Depending on the shape of the car seat, the length of the seat belt and the location of the anchor point, the seats of some children can be placed in the front or back. All these factors make it difficult to make the children's seats that fit all models. And yalis machine-made child seats can solve the existing problems at one point.