###### Abstract  
As a green, safe, and efficient method of coal development, underground coal gasification (UCG) technology has gradually moved from the experimental stage to the industrial production stage. This technology plays one of the key roles in the sustainable development of resources and energy. However, underground mining will inevitably lead to strata movement and surface subsidence, which will have certain impacts on the surface environment and buildings. Currently, limited research results on strata movement and surface subsidence under high-temperature environments hardly support the further development of the UCG technology. Hence, this study aims at the key problems of UCG strata movement and surface subsidence prediction. The study established a numerical model to analyze the effects of thermal stress and coal-rock burnt on strata movement and surface subsidence. Results show that coal-rock burnt caused by high temperature has greatly changed the characteristics of UCG strata movement and surface subsidence and is the main controlling factor for aggravating the strata movement and surface subsidence of UCG. The coordinated deformation calculation method of the UCG cavity roof-coal pillar-floor is formed. Moreover, the cooperative subsidence space is regarded as the mining space. A prediction model of surface subsidence based on continuous-discrete medium theory is also established using the probability integral method. The reliability of the predicted model is proved by comparing the measured value with the predicted value. ul 2023 13, 51922 March 20231  
surface subsidence and grassland degradation, waterlogging, and the destruction of surface structures [5; 6]. Many scholars have conducted considerable research on surface subsidence caused by shaft mining. The results provide an essential reference for solving the surface subsidence problem. Nevertheless, unlike conventional cave mining, during the gasification process, the temperature field will spread rapidly in the strata; the high temperature generates thermal stress and changes the mechanical properties of the surrounding rocks in the combustion cavity. Numerical simulation and theoretical modeling are mainly used to study the temperature field distribution of surrounding rock in the goat caused by high temperature [7; 8; 9; 10]. Many scholars have also used the methods of similar material simulation, numerical simulation, and theoretical modeling to analyze the influence of high temperature on the movement and failure of overlying strata [11; 12; 13; 14]. In the current research on the design of underground gasifier, the width of the combustion cavity is often less than 50 m; the mining area is often laid out in a strip arrangement. These cases will lead to special laws of strata movement and surface subsidence, bringing certain obstacles to the environmental impact assessment of UCG [15; 16; 17]. Therefore, studying the law of strata movement and the prediction method of surface subsidence caused by UCG is very important to solve the environmental problems caused by UCG mining. In the long history of coal mining, the expected problem of strata movement and surface subsidence prediction caused by mining has been a research hotspot for experts in related fields. Great progress has also been made in the study of the strata movement of UCG. [PERSON] proposed a thermal-mechanical coupling numerical simulation method considering the expansion of the cavity and studied the deformation of the surrounding rock during UCG [18]. [PERSON] studied the influence of different coal types on the strata movement characteristics of UCG and found that the stronger the coal bond, the smaller the strata deformation [19]. [PERSON] analyzed the influence of high temperature on the deflection of rock beams by establishing a multi-layer thermos-elastic foundation beam model and obtained the movement law of overburden strata in strip UCG [20].