Abstract:The effects of calcium level on calcium absorption and utilization, fruit quality and yield of infinite growth tomato were studied by using the integrated technology of water and fertilizer in substrate cultivation with different levels of calcium nutrition (0, 1, 3 and 6 mmol/L). The results indicated that the distribution of calcium in different parts of tomato plant was very uneven, and the calcium content of the same part varied greatly in different periods. The distribution and change of calcium in plant were affected by the level of calcium nutrition and temperature. With the increasing of calcium level, the calcium content of tomato fruit increased continuously, and calcium deficiency would reduce the yield and quality of tomato fruit. Although there was antagonistic relationship between calcium and K, Mg, P, N, high calcium would not cause the decline of fruit yield and quality. High temperature could induce calcium deficiency symptoms and umbilical rot of fruit, which seriously affected the yield and quality of tomato. High calcium treatment had a certain mitigative effect on high temperature stress.