The water activity of Mars has been characterized as the focus of Mars’ detection and research. It is generally considered that surface-water activities in Mars have declined gradually since the Noia (approximately 3.7 billion years ago). Entering the Amazon (about 3 billion years ago to date), the climate has become arid and the water is stored mainly in the form of ice in the soils and rocks below the surface of the two polars and the medium altitude. In May 2021, our “Houses I” detector ar...