Abstract: A forced-air pre-cooling experimental device was established to study the ratio of open area for the tomato package. The pressure drop characteristics of tomatoes were studied. The effects of airflow velocity, ratio of open area and length of the package on the characteristics of pressure drop and energy consumption were analyzed. Some relationships were found out. The pressure drop characteristics could be described by the Ramsin equation. The pressure drop between front and rear of the package increased with the addition of airflow velocity. At the same airflow velocity, the pressure drop decreased with the addition of ratio of open area in two sides of the package. The length of pre-cooling package was linear with the critical ratio of open area, so was the relationship between airflow velocity and energy consumption. The ratio of open area based on different lengths of tomatoes pre-cooling package was optimized. The research has reference value for the optimization design of the tomato pre-cooling package.