The single-factor randomized block experiment was adopted and found out that different density of paclobutrazol and ethephon had different influence on the flowering rate of ‘Tainung No.1’ Mango.The results showed that 300，450，600 mg/L paclobutrazol and 200，250，300 mg/L ethephon，all of them would improve secondary flowing rate.Paclobutrazol in a certain range of concentration（300～600 mg/L）increased with the dose to enhance efficacy.250 mg/L ethephon had a higher rate than 200 mg/L ethephon.However，300 mg/L ethephon had a lower rate than 250 mg/L ethephon because of a serious gum.What’s more，the length of florescence had decreased in varying degrees after treated with paclobutrazol and ethephon.