Abstract: Tillandsia bergeri was chosen as subjects,changes of Endogenous Hormone Content in Leaves of T. bergeri during the Flower Bud Differentiation Period were studied. The concentration of endogenous hormones,ZRs,GAs,IAAand ABAin the leaves were detected. Experiment results showed that Exogenous ethephon had significant effect on flowering of T.bergeri,and increased its tidiness substantially. External ethephon treatment reduced the concentration of IAA and GAs ,and increased the content of GAs in the development of floral organs. In the flower bud induction period, the content of ABA and ZRs increased; In floral organ development period, the content of ABA and ZRs hormone levels recoveried to normal level. The process of flower buds induction can be promoted by low concentration of IAA and GAs,while high concentration of IAA and GAs was conducive to the formation of flower morphology.High concentration of IAA/GAs, ABA/GAs, ZRs/GAs and low concentration of IAA/ZRs was conducive to the flower bud induction and germination of T.bergeri; Hormone balance played a key role in the flower bud induction period of T. bergeri .