This experiment was conducted to study the effects of different lighting time on egg productionand reproductive endocrine． 120 healthy ducklings of 33 weeks age were randomly selected and dividedinto group A，B，C and D on average． 1st －42nd day，the light program of group A，group B，group Cand group D was taken as 11. 5L∶13. 5D，14L∶ 10D，16L∶ 8D and 18L∶ 6D( L: light，D: dark) ; 43rd －70th day，four groups of light programs were 18L∶ 6D． Egg production，egg quality and feed consumptionwere statisticsed． The serum reproductive hormone such as luteinizing hormone，progesterone，estradioland melatonin levels were determined by blood sampling in the 42nd and 70th days． The results showedthat，1st －42nd day，The egg production rate of group D was higher than other three groups． The averagenumber of eggs was significantly higher than that of the other three groups ( P ＜0. 01) ． But there was nosignificant difference between groups A，B and C ( P ＞0. 05) ． The average egg quality in group D wasthe lowest among the four groups，but there was no significant difference among the groups ( P ＞0. 05) ．And the feed ratio in group D was the lowest． The level of luteinizing hormone and progesterone in groupD was significantly higher than those in group B，progesterone in group D was significantly higher thanthose in group A ( P ＜0. 05) ． And there was no significant difference in serum reproductive hormone me-latonin levels between other groups ( P ＞0. 05) ． During 43rd －70th day，there were no significant differ-ences in egg production rate，average number of eggs per day，average egg weight and feed ratio ( P ＞0. 05) ． The serum reproductive hormone levels were determined by the 70th day，and the differences be-tween the groups were not significant ( P ＞0. 05) ． This experiment found that the continuous illuminationof 18 h could significantly improve egg producton and feed ratio，improve the reproductive hormone level．