We already know that the Earth is a huge magnet, what is the relationship with the geological conditions? What is the magnetic field in the universe? At least we have seen brilliant northern lights in the pictures. China has recorded the Northern Lights since ancient times. The northern lights are actually the result of the interaction between the particles in the solar wind and the geomagnetic field. Solar wind is the high-energy charged particle stream emitted by the sun. When they reach Earth, they interact with the Earth's magnetic field as if current-carrying conductors were stressed in a magnetic field, causing the particles to move and collect to the North and South Poles and collide with the lean gas at high altitudes over the Earth, causing the gas Excited molecules to light. Sunspots are very intense areas of activity on the sun. The outbreak of sunspots can have an impact on our lives, such as the temporary suspension of radio communications. Therefore, studying sunspots is of great significance to us. Geomagnetic changes can be used to prospect the deposit. Since all substances have strong or weak magnetic properties, if they are grouped together to form a deposit, they will inevitably interfere with the geomagnetic field in the vicinity and cause anomalous conditions in the geomagnetic field. Based on this, the magnetism of the earth can be measured on land, sea or sky, geomagnetic maps can be obtained, areas of abnormal magnetic field on the geomagnetism analyzed and further explored, and often unknown minerals or special geological formations can be found. Rocks of different geological ages tend to have different magnetic properties. Therefore, we can judge the change of geologic age and the change of crust according to the magnetism of rock. Many mineral resources are symbiotic, meaning that several minerals are mixed together and they have different magnetic properties. The use of this feature, people have developed a magnetic separator, the use of different components of different magnetic minerals and magnetic strength difference, with magnets to attract these substances, then they are attracted by the attraction will be different, the results can be mixed together Different magnetic minerals separated to achieve the magnetic beneficiation.