With the increasing demand for green environmental protection resources in the new era, geothermal resources are about to enter a large-scale development stage. At present, PDC bits are mainly used to achieve the economic and efficient access to geothermal resources. However, when drilling into high-temperature hard formations, there are problems with conventional PDC bits such as poor high-temperature resistance, slightly lower hardness than required, insufficient wear resistance. This paper summarizes the three wear mechanisms of PDC cutters: abrasive wear, impact wear, and thermal damage, which occur in drilling deep high temperature hard formations. Four methods for improving the high temperature resistance, hardness, and wear resistance of PDC cutters are described: coating technology, improvement of drilling parameters, composite drill bits and brazed cutting teeth. According to the current research situation, it is recommended that experiment on single PDC cutters be carried out from the perspective of combining the realization of independent analysis with the cutter correlation, and the design be optimized by dynamic modeling and real-time simulation of the working status.