In this paper，pot experiments were carried out to study the effects of three kinds of summer green manure(Hibiscus esulentus L .，Crotalaria juncea L . and Cassia tora Linn.)on soil nutrient and base ion content in greenhouse，in order to provide a scientific basis for planting green manure to improve the soil during the summer fallow period of the greenhouse.The results showed that:1)after 60 days of planting Hibiscus esulentus L .，Cassia tora Linn. and Crotalaria juncea L .，compared with the control treatment，Hibiscus esulentus L .，Cassia tora Linn. and Crotalaria juncea L . significantly increased the available phosphorus content of soil，the increased proportion was 8.6%，13.2% and 25.7%，respectively.The treatments of Hibiscus esulentus L . and Cassia tora Linn. significantly reduced the soil electrical conductivity，and the reduction ratio was 25.0% and 33.3%，respectively，which had a significant improvement trend and effect on the secondary salinization of protected soil.Cassia tora Linn. and Crotalaria juncea L . significantly reduced(K++Na+)/(Ca2++Mg2+)by 17.0% and 35.6% respectively，which contributed to the formation of soil colloid and soil aggregate structure.2)After 110 days of pressing the green manure，compared with the control treatment，the conductivity of Hibiscus esulentus L . and Cassia tora Linn. treatment did not change significantly，but Crotalaria juncea L. treatment increased the conductivity by 50.0%.Hibiscus esulentus L .，Cassia tora Linn. and Crotalaria juncea L . all significantly increased the content of available potassium in the soil，with an increase rate of 23.7%，5.7% and 9.4%，respectively.The treatments of Hibiscus esulentus L . and Cassia tora Linn. significantly increased the total nitrogen content of soil，with the increasing proportion of 17.8% and 26.0% respectively.Both Cassia tora Linn. and Crotalaria juncea L . significantly reduced(K++Na+)/(Ca2++Mg2+)by 24.1% and 18.5% respectively，indicating that the effect of fertilization was significant after three green fertilizers were turned over.3)On the whole，planting green manure has the trend of significantly improving the secondary salinization of soil，which is beneficial to improving the secondary salinization of soil，and the effect of green manure is more significant after turning over.There fore，in the summer fallow period of the greenhouse，the total amount of soil base ions could be reduced by planting summer green manure with short growth cycle and strong adsorption capacity，but it is not suitable to turn over.Among the three kinds of summer green manure，Cassia tora Linn. is recommended as a filling crop to improve the secondary salinization of soil during summer leisure period in greenhouse.