In geothermal well construction， cementing is indispensable to ensure the outlet water temperature and enhance wellbore durability. Currently， class G cement remains the primary choice for geothermal well cementing. However， complex environments such as large geothermal gradients， fractured formations and the presence of corrosive media require more strict performance requirements for traditional portland cement systems. This paper analyzes existing technical strategies and future development trends of portland cement systems from three aspects： high-temperature resistance， corrosion inhibition， and low-density performance. The results indicate that the most commonly used method to overcome the deterioration of high-temperature performance of cement is adding silica powder or silica sand and reducing the calcium silicon ratio of the system to adjust the hydration product type. Corrosion inhibitors have evolved from single organic/inorganic inert materials to water-based latex， acid responsive latex， and organic/inorganic composite multi-component anti-corrosion systems. The lightweight cement system formed by absorbing water and tackifier， low density reducing agent or foam still has some shortcomings， such as difficult density maintenance， slow strength development， poor stability， etc. In the future， emphasis should be placed on analyzing the main controlling factors of the strength degradation mechanism of cement and developing new strength degradation inhibitors. Establish multiphase dynamic corrosion conditions and conduct research on the corrosion mechanism of cement stone body and bonding interface. Forming a high-temperature resistant， corrosion-resistant， lightweight leak proof cement system by taking into account the complex environment of geothermal cementing and supplementing with fiber or other sealing materials. Facing the geothermal cementing environment， a comprehensive understanding of the current technical status and development trends of the existing portland cement system can provide reference for the research and development direction of geothermal cement.