Abstract: The application of BIM technology in prefabricated buildings is aiming at achieving complete plan, precise design, construction simulation and analytical deduction, which ensures the accuracy of the model, and achieves fast, qualified and accurate models and drawings. This paper discusses five methods to effectively improve the design efficiency of prefabricated components, including the PLANBAR prefabricated design, the GDL parameterized design, optimization of pre-embedding design, one-button drawing, and proofreading optimization. Through the analytic demonstration of a case study that compares the five methods, the PLANBAR prefabricated design is the best one with 65% efficiency improved on average compared with using the CAD 2D platform under the same condition. If provided with the design material list, the design efficiency will be improved more obviously. The paper also put forward the next-step direction of efficiency promotions, through the analysis of practical application data.