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In the production process of tomatoes in winter greenhouses, external enlarged and hollow fruits are easy to appear, which not only affects the yield, but also greatly reduces the quality and taste of the tomato. The direct cause of tomato's "hollow" is due to the fact that the temperature of irrigation in the greenhouse is lower than 7 °C. At low temperatures, the roots of tomato are cold-shrunk, the root vigor is reduced, and the water absorption is poor. At this time, the fruiting results are in an expansion stage. In the short-term lack of water supply, the phenomenon of local flesh-eaten fruit tends to occur. Although the ground temperature was later increased, the roots recovered water, but the hollow part of the expanded fruit could no longer be enriched. Therefore, the water temperature of tomato in winter greenhouse can not be lower than 10°C, and the phenomenon of “hollow†in tomato can be avoided.