The prostheses on the market are expensive, have a long custom cycle and require a lot of training. The core needs of disabled children are: continuous hand growth, maintenance, and replacement requirements; muscles are developing control needs to be simple. Filling the gaps in the market for domestic limb-assisted children's aids to meet the size adjustment of children's continuous hand growth. Using 3D printing technology, convenient, fast, customizable and simple operation.The innovative grip structure is more labor-saving, and the grip is strong. The adjustable tension line elastic structure can meet the long-term use loss and still maintain the best driving force.Simple operation does not require children to use a lot of training, low learning cost; customizable design, comfortable man-machine design, to meet the comfort of children 6-12 years old.