The accuracy of implantation for single posterior tooth loss directly affects the seating stability of restorations, occlusal function and long-term osseointegration effect. Traditional implantation relies on doctors' experience for manual positioning, which is prone to causing deviations in the position and angle of implants. In clinical practice, problems such as difficulty in seating restorations and osseointegration failure caused by deviations account for more than 30%. Based on three-dimensional imaging and computer-aided design technology, the digital guide plate provides precise guidance for implant positioning. This paper quantitatively analyzes its accuracy from three-dimensional implant position deviation, occlusal adaptation and osseointegration stability. It then discusses, in depth, the key factors affecting accuracy in four stages-data collection, scheme design, guide plate fabrication and clinical operation—and proposes targeted optimisation strategies, so as to provide a more comprehensive theoretical basis and clinical operation guide for the precise implementation of implantation for single posterior tooth loss.