Invasive neural electrodes promote human understanding of neuroscience to the micrometer and millisecond scale. Due to the large mechanical mismatch between traditional rigid electrodes and soft brain tissues, flexible electrodes have become the new trend of neural electrodes. The flexibility of the neural electrode reduces the immune response while losing the implantation stiffness. The implantation mechanism of the neural electrode was reviewed and current researches on the implantation strategies of the flexible electrodes were summarized, so as to help solve the loss of implantation ability of flexible electrode and acute implantation injury. Based on the characteristics of various implantation strategies, the prospect of flexible electrode implantation strategies was proposed.