The invention relates to conjugates of saturated aliphatic chain 
alcohol, 
dexamethasone, and Glu-Asp-Gly, preparation, a nano structure, and applications thereof. The invention discloses 6 saturated aliphatic chain 
alcohol modified 
dexamethasone-Glu-Asp-Gly conjugates represented by the formula 10 a-f, wherein in the formula the n represents 7, 9, 11, 13, 15, or 17. The invention also discloses a preparation method, a nano structure, 
immunity inhibition activity, 
inflammation inhibition activity, and pain relieving activity of the conjugates. The invention also finds that the conjugates do not have any 
side effect leading to 
osteoporosis. The researches on the inhibition effect of the conjugates on 
splenic lymphocyte mitogen proliferation reactions and the survival time after mouse retroauricular 
cardiac muscle transplant show that the conjugates have an excellent 
immunity inhibition effect. The researches on the effect of the conjugates on the swelling degree of mouse ears which are inflamed due to 
xylene show that the conjugates have an excellent anti-
inflammation effect. The researches on the effect of the conjugates on mouse heat 
radiation tail flick time show that the conjugates have an excellent pain-relieving effect. The researches on the effect of the conjugates on the mouse 
thigh bones show that the conjugates cannot cause 
osteoporosis. So the conjugates have a wide application prospect in the preparation of 
immunity inhibition drugs.