Citrus×limon ‘Yunning 1’ planted in Ruili of Yunnan was continuously irrigated with 0.1， 0.5， and 1.0 g·L^-1 fulvic acid and sodium humate respectively， and total flavonoids contents in leaves of C.×limon ‘Yunning 1’ in different months were compared. The results show that compared with the blank group， fulvic acid and sodium humate treatment groups have promotion effects on total flavonoids contents in leaves of C.×limon ‘Yunning 1’ in general， in which， total flavonoids contents in leaves of C.×limon ‘Yunning 1’ in 0.1 and 0.5 g·L^-1 fulvic acid treatment groups in February 2021 and 0.5 and 1.0 g·L^-1 sodium humate treatment groups in October 2020 and February 2021 are significantly （P<0.05） or extremely significantly （P<0.01） elevated. It is suggested that irrigation with 1.0 g·L^-1 sodium humate has a relatively good promotion effect on total flavonoids content in leaves of C.×limon ‘Yunning 1’ in the early stage of treatment， while the promotion effect of irrigation with 0.5 g·L^-1 fulvic acid is relatively good in the later stage of treatment.