Abstract: The best way to repair edentulous patients has always been a controversial topic. With the continuous development of implant technology, the challenge for edentulous reconstruction is how to reduce the difficulty and cost of surgery while ensuring the quality of repair. "All-on-Four" technology is currently a hot spot in clinical research. It can maximize the use of residual alveolar bone to achieve immediate loading and avoid complex bone grafting, which is widely popular among clinicians and highly accepted by patients. However, "All-on-Four" technology also faces many challenges. Indications of surgical treatment, surgical procedures, prosthetic plans and prosthetic complications are still to be discussed. This article will discuss, summarize and reflect on the advantages and disadvantages of "All-on-Four" implant technology to help clinicians use it reasonably.