Special vehicles often work in low temperature environment. Nevertheless, the lubrication flow field and oil distribution of gear in low temperature environment is still unclear. A visualized test bench for measuring the flow pattern of low temperature lubricating oil flow field is built. The transmission system component gear is simplified as rotating disk in the study. The variation rule of lubricating oil flow pattern with the disk speed at -20 celcius of the rotating disk are obtained. It is found that the lubricating oil flow pattern of the disk can be divided into coated, involute and reverse oil film flow pattern. The moving particle semi-implicit (MPS) numerical method can effectively simulate the flow pattern of the lubrication flow field of the disk. The mechanism of the change of oil film flow pattern of rotating disk at low temperature is revealed. The results show that the flow pattern of the oil film is greatly affected by centrifugal force. When the oil film flow pattern is involute, a clear separation point appears between the oil film and the disk. When the oil film flow pattern is reversed, the radial end face oil film of the disk disappears and there is less surface oil. It has theoretical guidance significance for the gear lubrication design under low temperature conditions, and provides a numerical calculation method of low temperature lubrication flow field.