Abstract: To study the regulation mechanism of plant endogenous hormones（IAA，ZR，GA3，ABA）on the flowering period of Lonicera japonica Thunb.，the main plant of the Lonicera japonica Thunb. cultivar‘Damaohua’flower and the new cultivar‘Telei 1’was used as experimental materials. The changes of flower color，morphology and flowering period in each developmental stage of two cultivars were observed，and the dynamics of four endogenous hormones in different developmental stages were detected by enzyme-linked immunosorbent assay. The results showed that the flowers of‘Telei 1’were larger than that of‘Damaohua’，and the two white period，great white period and falling period also lasted longer. During the whole flowering period，the contents of‘Telei 1’and ‘Damaohua’ZR and GA3 showed the trend of increasing and then decreasing，and the content of ABA showed a gradual increase trend. The content of IAA of‘Telei 1’firstly decreased，then increased，then falled and then rose again，the IAA content of the‘Damaohua’firstly decreased and then rose. In the great white period，the content of IAA and ZR in‘Telei 1’was 3.36 times and 1.61 times that of‘Damaohua’，and the content of ABA and GA3 was 0.28 times and 0.89 times that of‘Damaohua’. The ratios of IAA/ABA，ZR/ABA，IAA/GA3 and ZR/GA3 of‘Telei 1’were 11.96 times，5.67 times，3.80 times and 1.81 times of‘Damaohua’，and the ratios of ABA/GA3 and ZR/IAA were 0.32 times and 0.45 times that of‘Damaohua’. The main factors that affected the white period duration of‘Telei 1’were high IAA and low ABA content，as well as high ratio IAA/ABA， ZR/ABA，IAA/GA3 and low ratio ABA/GA3，ZR/IAA. In conclusion，with the use of exogenous hormones to control the flowering period，this study prolonged the harvest period of Lonicera japonica Thunb.，increased the yield and quality，and lay a foundation for further study of the molecular mechanism of flowering elongation.

Key words: Lonicera japonica, flowering prolongation, endogenous hormone, delayed flowering, regulation mechanism