Abstract: Abstract： By the growth chamber method, the effects of ethylene (ETH)，kinetin (KT),6-BA and their compound ETH-KT,ETH-6-BA on the morphological features, biochemical composition, endogenous hormones and tissue structure of mung bean seedlings were investigated. In order to provide the support of theory and technology for mung bean sprout production.Compared to the control, the number of lateral roots was reduced, the growth of roots and hypocotyls were suppressed and the diameter of hypocotyls was increased four five treatments（P<0.05）.Their regulation effects were ETH-6-BA>ETH-KT>ETH>6-BA>KT respectively. The length of hypocotyls was suppressed at 35.78 %, the diameter of hypocotyls was increased at 26.51 %, the length of root was suppressed at 65.43 % and the secondary roots were inhibited completely by ETH-6-BA respectively. The biochemical composition and endogenous hormones in mung bean seedlings were changed for five treatments（P<0.05）.The regulation effects were ETH>ETH-KT>ETH—6-BA respectively. The soluble protein content was increased at 25.1%, the soluble sugar content was increased at 66.07%, and Vitamin C content was increased at 163.9% by ETH. The endogenous hormones in mung bean seedlings were changed for five treatments. The indole-3-acetic acid (IAA) content were decreased at 88.8 % and 33.3%, while ZR content were decreased at 35.3% 和22.8% by 6-BA and ETH-6-BA respectively. ABA content was improved at 156.9% by ETH-6-BA. The thickened effect of ETH on the hypocotyls diameter was explained by increasing number of pith cells and decreasing area of single cortex cell, showed the area of the marrow and cambium increased. Theirs effects of 6-BA and ETH-6-BA was by increasing the area of single pith cells and cortex cells, and increasing the area all of marrow, cambium and the cortical area.