Abstract: The effects of different dehumidified treatments on tomato growth and nutrients accumulation inside greenhouses were studied.The results show that the tomato plant becomes more higher,the cauline diameter becomes more bigger,and marked differences exist compared to the CK,inflorescence number,flower number,fruit number are increased markedly after condensation by underground heat-circulation,but leaf number,bud number,shatter number in addition to organic C,Ca and Mg is contrary after two different dehumidified treatments.While the differences exist including total N,total P,total K after two dehumidified treatments.No marked influences on the assignment rate of tomato dry matter exist after the two treatments.