We have found that the bicycle category has a relatively big pain point: Many children were very curious about bicycles when they were young, and wanted to have a bicycle of their own. However, based on the consideration of children's safety, parents basically require children over 12 years old to ride the bicycle by themselves. And now there is a lack of a bicycle between parents and children that can interact with each other. At present, the competing products on the market are tandem bicycles such as amusement parks, which are difficult for mass users to buy and use. And it can't be convenient to carry and use when going out. When two people are riding a bicycle, they are all coaxially stepping on the pedals of the bicycle. It is difficult for children to have their own experience. Based on these pain points, we innovatively proposed the concept of a parent-child folding bicycle