Jumbo flying squid(Dosidicus gigas) was one of the important economic oceanic cephalopods,playing an important role in the food web.According to the analysis of 383 samples of stomach contents caught by squid jigging fleet in waters off Peru from September to October in 2009,the temporal and spatial variation of feeding behavior was analyzed.It was found that the difference of the monthly degree of stomach fullness was significant(P<0.01),and the mean value in September was higher than that in October.But the difference between male and female was not significant(P>0.05) as well as the diurnal variation.However,the day and night difference of the level of digestion was significant(P<0.01),and the level dropped to the lowest at local time(19:00,the following similar),the average value was 1,up to the highest,grade 6 at 03:00.Predation mainly occurred during the 19:00 and 21:00,almost no continual feeding behavior has been found.The empty stomach was only found in the 25-50 cm mantle length(ML) individuals.There was no fish found in the stomachs of 20-25 cm ML individuals,but the highest proportions of fish appeared in 25-60 cm ML groups.There was only fish debris in the stomach content of larger individuals,which were longer than 50 cm ML.Cephalopods and crustaceans were mainly fed by 25-35 cm ML,40-45 cm ML and 25-40 cm ML individuals,respectively.However,diet selection had no significant difference(P> 0.05).