Abstract: To better provide meteorological service of spring frost forecasting for processing tomato, the authors chose processing tomato variety‘Liger 87-5’as material, to simulate the natural frost cooling process by using the MSX-2F artificial frost box system. The authors obtained leaf temperature by the thermocouple probe, detected the frostbite and death statistics, took the changes in fluorescence into consideration and preliminarily established the meteorological index of spring frost of processing tomato. The results showed that: (1) the minimum temperature for all tomato seedlings from being frozen to death was ≤-5℃; (2) the super cooling point of tomato concentrated in the range of -3.1- -5.0℃, freezing point in the range of -2.4- -4.9℃; (3) the tomato with relatively small seedling age had a stronger cold-hardiness; (4) the land surface temperature index in light frost and heavy frost of tomato seedlings was -2℃ and -4℃, respectively.