There were three groups in the experiment，each group was randomly selected 32 Maganggeese to study the effects of different light time on the growth performance of goose and serum endotoxincontent． The control group received normal light ( 12L∶ 12D) ( L: light，D: dark) ，the short-photope-riod group received 9 hours light ( 9L∶ 15D) and the long-photoperiod group received 15 hours light ( 15L∶ 9D) ． After 8 weeks，the growth rate of body mass，survival rate，feed gain ratio and serum endotoxinwere measured． The results showed that body mass in the control group was significantly higher than thosein the short-sunshine and long-sunshine group ( P ＜0. 05) from week 7． It was found that the feed con-version rate was highest in the control group at the early stage ( 4 －8 weeks) ，while that was highest atthe long-sunshine group in the latter stage ( 9 －12 weeks) ． The survival rates of the control group andlong-light group reached more than 80. 0%，while the survival rate of the short-day group had only66. 7%． The mean serum levels of endotoxin in the control group were lower than those of the other twogroups during the whole experiment． Thus，the different light time could affect the growth performanceand serum endotoxin content of Magang goose． In this experiment，geese that received normal light ( 12L∶ 12D) had better growth performance，and long photoperiod could improve the feed gain ratio of geese inlater growth and development stage．