This product is a rigorously optimized specialized cryopreservation medium designed for the long-term cryopreservation of trophoblast cells such as embryonic feeding layer cells. Its formulation builds upon classical cryopreservation principles with the addition of functional protectants tailored to the characteristics of feeder cells. This enables efficient maintenance of cell membrane integrity and critical secretory activity during freeze-thaw cycles, ensuring high survival rates and normal growth factor secretion upon cell recovery. It provides stable, functionally intact standardized feeder cell resources for stem cell research, comprehensively safeguarding the continuity and reproducibility of related experiments.