Abstract: Liquid residence time distribution in an entrained flow bed was studied. The effect of liquid flux, gas flux and gas momentum on the liquid residence time distribution was investigated. As the liquid flux increase, the curve of the liquid residence time distribution becomes higher and narrower and the mean residence time becomes shorter. The liquid residence time distribution moves forward when the gas flux increases, but the effect recedes when the gas flux is over 4L/min. The gas momentum has a great effect on the liquid residence time distribution when the liquid flux is smaller than 60L/h, and the larger the gas momentum, the longer the mean residence time . The liquid flow pattern was studied in both centersection and wallsection based on the experimental value analysis and the phenomenon in the experiment. The mathematic model is established to simulate the liquid residence time distribution in the entrained bed, and the simulating value is fitted well with the experimental value.