Based on the analysis of chlorophyll fluorescence parameters,we investigated the light responses of PSⅡ photochemical efficiency,photochemical and non-photochemical quenching processes in flag leaves of booting stage with three local varieties of spring wheat (Triticum aestivum L.).The results showed that:(1)There was a difference of chlorophyll (Chl) content among three local wheat varieties,but the maximum quantum photochemistry efficiency of PSⅡ (F_v/F_m) had no significant difference among them.(2)As the increase of light intensity,the PSⅡ maximal photochemical efficiency (F_v′/F_m′),PSⅡ actual photochemical efficiency (Φ_PSⅡ),PSⅡ photochemical quenching coefficient (q_P) and the fraction of PSⅡ reaction centers that are opened (q_L) all exhibited a decreased tendency.Under low light intensity,F_v′/F_m′,Φ_PSⅡ,q_P and q_L of wheat flag leaves decreased from ‘Humai 12’ through ‘Huzhuhong’ to ‘Humai 13’.Under the middle and high light intensity,changes of F_v′/F_m′ values in three varieties tended consistent,but the values of Φ_PSⅡ,q_P and q_L in ‘Huzhuhong’ were slightly higher than that of other two.(3)The values of PSⅡ non-photochemical quenching coefficient (NPQ),apparent electron transfer efficiency (ETR),the quantum yield of quenching due to light-induced processes and non-light-induced processes (Φ_NPQ and Φ_NO) tended to increase with the increasing of light intensity.Under low light intensity,the NPQ and Φ_NPQ decreased from ‘Humai 13’ through ‘Huzhuhong’ to ‘Humai 12’,changes of ETR in ‘Huzhuhong’ and ‘Humai 12’ tended consistent,value of ETR in ‘Humai 13’ was the lowest among three varieties.Under the middle and high light intensity,NPQ and Φ_NPQ decreased from ‘Huzhuhong’ through ‘Humai 13’ to ‘Humai 12’,the ETR showed a decreased tendency from ‘Huzhuhong’ through ‘Humai 12’ to ‘Humai 13’.During the whole changes in light intensity,Φ_NO decreased from ‘Humai 13’ through ‘Humai 12’ to ‘Huzhuhong’.The study suggested that ‘Huzhuhong’ showed strong adaption to high light intensity environment among three varieties.Moreover,‘Humai 12’ had more higher capacity of solar energy usage than ‘Humai 13’ but weaker than ‘Huzhuhong’.‘Humai 13’ was more sensitive to the changes in light intensity than the other two,and it had weaker excitation energy dissipation capacity than ‘Huzhuhong’ but better than ‘Humai 12’.‘Humai 13’had more higher ability of thermal dissipation at low light intensity.