Abstract: In order to transport water and generate electricity power in winter, and prevent ice disasters at the same time, it is necessary to conduct real-time monitoring on ice slush, so how to accurately calculate the density of ice slush is the key technology of monitoring analysis. In this paper, the ice slush monitoring images were processed by histogram equalization based on MATLAB, and using maximum between-cluster variance to obtain the optimal threshold value, so as to distinguish the ice and background, then the ice slush density was obtained and compared with the real ice slush density. The comparing results indicate that the calculated ice slush density based on histogram equalization is close to the real condition and it also can be used in the case of weak light environment.