CdS/CdTe polycrystalline thin film is a new type of high efficiency and low-cost solar cells, which is most promising for application in refrigeration, because it has many advantages such as few crystalline defects, large gap of energy, high stability, inexpensive and convenient for large area deposition. On the other hand, it is useful for environmental protection. The properties of CdS/CdTe thin film solar cell are revieweol and the development of the cell is presented. We have also described some large-area processing with low fabrication cost.