The effects of soil water preservation and growth of tomato in pot experiment were studied by using different concentrations of soil penetrating agents.The results showed that：application of four concentrations of soil penetrating agents all accelerated the permeation rate of water，penetrating agent also played a role in the retention of water with the concentration between 0.6~1.2 g/t brown soil.Different concentrations of penetrating agents also promoted chlorophyll content（SPAD value）of tomato leaves，plant height,stem diameter，root activity，dry and fresh weight of root and shoot.All the above tomato growth indexes reached the maximum when the soil penetrating agent concentrations was 1.2 g/t brown soil.In a word，application of soil penetrating agents could not only possess water retention property，but also promote tomato growth．Therefore，penetrating agent has the value of further research.