Abstract: The important factors that affect the water inrush level in mines are the intensity of water inrush, mine roadways and mine goafs. In order to study the characteristics and influencing factors of internal water level changes in the process of water filling in goafs after mine water inrush, an experimental platform was built to conduct experimental research on water filling in goafs. The results show that: under the blocking effect of gangue on water flow, the water filling process of the goaf is divided into the initial water flow spreading stage and the subsequent water filling stage. In the whole process, the water level near the working face is higher while the deep water level is lower, and the water surface slope appears and gradually decreases with time; the water filling rate of goaf increases with time and approximates a quadratic function change. Water inrush and mine spatial structure are important factors affecting the water filling process.