Spraying foliar fertilizer is one of effective methods to increase mung bean yield. Trace elements are also necessary for the growth and yield of mung bean except for nitrogen, phosphorus and potassium. The purpose of this experiment is to screen the best spraying period and formulation of foliar fertilizer to promote the growth and increase the yield of mung bean. Water（CK）,“Jindian + Zhonghuadafeiwang + Tiancibao”,“Jindian + Zhonghuadafeiwang + Tiancibao + Bihu”,“Jindian + Zhonghuadafeiwang + Tiancibao + Bihu + EM”were sprayed on leaves of mung bean in seedling stage, branching stage, squaring stage and flowering period, respectively. The result showed that spraying“Jindian + Zhonghuadafeiwang + Tiancibao + Bihu”made mung bean a higher yield, EM can be added as needed.