Abstract: Comparing to the open software movement, which is more mature, the open source hardware movement remains in its infancy. The main causes of this dilemma are the high economic costs and the lack of licensing agreement. With the development of three-dimensional printing, it offers the opportunity to overcome the economic and technical obstacles, and can provide firm procedure ground for the licensing agreement to be concluded under intellectual property law. In the environment of 3D printing, making open source hardware licensing agreement under patent right or contract binding has shortcomings. Therefore, it's enforceable to construct an open hardware license for three-dimensional under copyright law. The license agreement should include authorization provisions, duty provisions and disclaimer of warranty. The copyright law should take this opportunity to make progress in the fields of dealing with reverse engineering, extend the protection of right of reproduction of product design, and construct new kind of neighborhood right. Along with the proposing of reasonable license agreement, it may promote the development of open hardware for three-dimensional printing.