Using the ethrel respectively on 20 tablets to 23 piece of Guzmania sp.and Vriesea carinata two Bromeliaceae varieties with different concentrations of four flower forcing test，appropriate concentration of ethylene were determined,and to achieve the purpose of early flowering.The results showed that Guzmania sp.and Vriesea carinata with 200～400 mg/L of the vinyl and processing，processing to the number of days required to budding shortest，respectively for 69 and 66 days，be helpful for early flowering.