Abstract: Effects of several kinds of exogenous materials on the yield and quality of Maodou and resistance under Water stress were studied in the experiment. The results showed: increasing the root activity, the chlorophyll content, the proline content，relative water content and protective enzyme activity, suppressed MDA content, reduced the cell permeability compared with control after treated with these exogenous materials, and thus effectively enhanced the resistance of the seedling to the abnormal environment. From the comparison five kinds of exogenous materials treatments, BR treatments worked best under Water stress.BR treatments worked best on the yield and quality of Maodou．