Abstract: Monitoring of subsidence in coal mining has become an important task for mine production and environmental management. Given the instability of subsidence areas, the establishment and transmission of height datum is particularly important. In this paper, the characteristics and applicability analysis of the height transmission technology are carried out, and the GNSS and thirdorder leveling data of a mining area and its neighboring areas are used to carry out an example analysis of GNSS measurement of longdistanceheight transmission. The results show that the method in this paper can meet the demand of height transmission of the subsidence monitoring datum in the mine area.