In order to investigate the characteristics of temperature decreasing of litchi fruits with packages during precooling in a cold room, a twodimension numerical model was built based on the test platform with controlled atmosphere for fruits and vegetables. According to the thermophysical properties of the package, litchi fruit and the platform, the process of the temperature decreasing of litchi fruit during precooling was simulated by Fluent, after which the airflow information in the container and package were obtained. After that, some results can be drawn. Improving the ventilation velocity can shorten the process of precooling but will improve the variable coefficient of temperature among litchi fruits in the package; When the air duct velocity is bigger than 6m/s, the cooling rate trends to be steady along with the growing of air duct velocity, the variable coefficient was steady at roughly 0.25; Reducing the air temperature on the partition outlet can effectively improve the temperature decreasing of litchi fruits during precooling but also will improve the variable coefficient of temperature among litchi fruits in the package. A test was done to verify the accuracy of the model, and it found that the simulation values and experimental values are in good agreement, the average difference rate (MD) is 1.91%, and the rootmeansquare error (RMSE) is 2.34%. Such results of this research reviews some characteristics of the precooling of litchi fruits with packages in a cold room, which can provide a reference value for the optimization of the equipments and technologies for litchi fruit.