Abstract: Taking ‘Endless Summer’ as the test material, the experiment mainly used 4 ℃ low temperature regulation and hormone（GA₃） treatment with different concentrations and spraying intervals to observe and analyze the changes in flowering period and flowering duration of each treatment, as well as statistical average flower number and flowering duration.The effect of temperature and gibberellin on the flowering period of the Hydrangea flower was studied, in order to regulate the flowering period of the Hydrangea before and after the Spring Festival and even New Year′s Day, while ensuring the quality of flowering, and explore the optimal flower promotion mode.The results showed that low temperature for 5,6 and 7 weeks could advance the flowering period of potted Hydrangea,and the plant growth improved with the increase of low temperature duration.Among them, heating and promoting flowering after 7 weeks of low temperature only taked 81 days to reach the initial flowering stage, which was 51 days earlier than the natural low temperature flowering stage, and the number of days observing flowers lasted for about 82 days.However, the flowering time was relatively short and the effect of observing flowers was not good.Compared to a single low-temperature treatment, combined with the appropriate concentration of gibberellin spraying could enhance the effect of promoting flowering and further advance the flowering period.However, high or low concentrations could easily cause abnormal inflorescence elongation or delay the flowering period.After 6 weeks of low temperature, spraying gibberellin with a concentration of 7.5 mg·kg^-1 three times at intervals of 7 days had the best effect on promoting flowering.It could enter the initial flowering period around January 20^th,and the flower observation could last for 60 days.At the same time, the overall plant had better ornamental quality.The best combination could be used to regulate the flowering period of potted Hydrangea by low temperature induction and exogenous gibberellin in production and improve the quality of flower induction, and provide reference for the research on the control technology and mechanism of flowering period of potted Hydrangea.