This paper studied the temperature distribution of different mode of liquid supply in plate freezer under the same working condition, and analyzed the reasons for the inequality freezing rate of the flat plate. The freezing experiment of the fluid supply with ejector and the expansion valve at the same condense temperature in 35 ℃ was carried out respectively. The results showed that: at the end of freezing, the minimum temperature reached to -35.9 ℃ by using expansion valve, and the maximum temperature difference of frozen products was 17.55 ℃. The temperature difference of each layer was large, and the temperature distribution of plate was chaotic. In mode of ejector supplying liquid, frozen temperature distribution was uniform, the maximum temperature difference was 5.54 ℃ at the end of experiment. Meanwhile, each layer plate of temperature decreases gradually from top to bottom, freezing rate increases gradually, and the bottom plate freezing time was shorter than the top about 9.1%. To a certain extent, this study can prove the effect of the temperature difference distribution of the evaporated plate on the freezing time and energy consumption.