Abstract: Since the idea of water-ice on the moon was put forward by American scientist Kenneth Watson in 1961, whether there is water in the permanent shadow area has been debated. Lunar water-ice is a major scientific problem related to the "dry" and "wet" theory of the moon. Since the 1990s, the existence of water-ice in the permanent shadow area of the lunar polar region and the problem of water in the early lunar period have become the hot spot of international lunar exploration. Based on the research status of lunar water, the key scientific problems related to lunar water are analyzed from different space dimensions and different exploration methods, and the science objectives, the payload configuration and technical indicators of China's follow-up lunar water-ice exploration projects are put forward