Abstract: Abstract：Objective To evaluate the value of computer navigation +homemade surgical guide technique in the area of the posterior mandible. Methods Make model of the teeth lost region，then select implantation poin and the first guide was made. CT data was collected and Simplant software was used for data analysis；use a grinding instrument to determine the direction of the final implantation and final surgical guides. The guides were worn，then measure preoperative and postoperative angle and depth deviation. Results By comparing the measured data，the portion of implants in the buccolingual direction had a deviation，which was about 10 degree；angulation abutment can adjust the dental prosthetic restoration to a correct occlusion relationship. Planting depth and mesiodistal had small deviations before and after the implant. Conclusion The system can help clinicians to implant under inadequate height conditions，which is of great significance in improving the quality and accuracy of implant surgery.