Soil moisture monitoring plays an important role in the environment management for the mining area. By taking the arid-to-semiarid Shendong mining area as an example, soil moisture was retrieved by using thermal inertia method. According to the synchronous field survey, in the densely covered area, the remotely sensed result is not significantly correlated with field data; contrarily, in the sparsely covered area, the correlation is significant and the remotely sensed result is well correlated with field data on the soil of 10-cm depth. The linear regression model was established to monitor the soil moisture in the mining area. Compared with the background, the soil of 10-cm depth has not got dry in the mining area during the last nine years. The primitive analysis indicates that making use of mine drainage and the measurement on environmental protection might be the main reason for that.