The prototype is the first sample of a new product, Although it is only a sample, but its role is not to be underestimated.Many manufacturers need to check whether the design on the drawing is reasonable by prototype making when developing new products, and then carry out large-scale production to avoid causing unnecessary losses.

From the function of the prototype on the division ,which can be divided into the appearance prototype and structure prototype.

The appearance prototype only requires that the appearance prototype is similar to the design product or exactly the same as the product and unable to sell , which is mainly used to participate in the exhibition, in order to test the market response, as well as the early stage of the marketing propaganda work.

The structural prototype can be mobile, For example, the automobile prototype. The structural prototype must have wheels, doors, car bottom, body, frame, assembled by loose parts, It's made up of pieces that need to be able to move around like a real car.Therefore, the structure prototype is relatively complex, and each structure position needs to achieve accurate tolerance, or it may not be able to be assembly.