Abstract: Effects of supplementary foods on longevity and fecundity of Microplitis prodeniae were investigated and the diet feeding rhythm was determined. Longevities of the females fed with sucrose-glucose- fructose mixture, glucose, sucrose, honey, fructose, water and nothing were 14.67, 11.22, 11.03, 10.00, 9.58, 4.67 and 3.65 d, respectively; for the males, 13.93, 10.67, 10.62, 9.60, 9.53, 3.50 and 2.72 d, respectively. Offspring numbers of M. prodeniae fed with the mixture, glucose, sucrose, honey, fructose and water were 180.45, 149.80, 147.30, 112.35, 122.45 and 31.05, respectively. Both longevity and fecundity of wasps fed with sucrose- glucose- fructose mixture were higher than those of wasps in other treatments. Regardless of nutritional supplements or only water, oviposition of the wasp increased initially and then decreased. Moreover, parasitoids feeding on a 10% (w/v) sugar solution lived longer than those feeding on other sugar concentrations. Parasitoids fed the sugar solution once per day lived the longest. Ad libitum feeding by the wasps peaked at 8: 00—9: 00 and 15: 00—16: 00.