This paper presents the working principle of rapid prototyping technology based on fused deposition modeling (FDM) and summaries its technology features. The basic constitution of FDM system, such as mechanical device and control cell, are discussed, respectively. Selecting a deep groove ball bearing as experimental object and manufactured in the MEM320A rapid prototyping machine to demonstrate the FDM fabrication process. Investigate into the application of FDM on production design, function demonstration and biomedical engineering. Finally, the future development of FDM is prospected.