According to the current problems of spares supply support, this paper introduces 3D printing technology to spares supply process so as to meet the needs of inadequate spares support. This paper also builds the supply process and maintenance system model under the structure of two level spares supply support, and see availability as the main indicator to weigh the efficiency of the model. In addition, divide the whole model into several processes and calculate system availability of initial model and the model of applying to the 3D printing technology during different stages by comparing the needs of the spares and two echelon inventory, then calculate the availability to compare the efficiency. Results indicate that the model of applying to the 3D printing technology with higher availability. The application of 3D printing technology provides a new way for support. At last, this paper analyzes the limitation of 3D printing technology according to its characteristic.