Abstract: Cnaphalocrocis medinalis is an important rice insect pest in China， whose mass rearing in laboratory is too difficult to limit its research This study reported the feeding preference of C medinalis larvae to various artificial diets containing different contents of nitrogen and soluble sugar The results showed that newlyhatched larvae preferred artificial diet with higher sugar Nitrogen content in diet showed no significant effect on the selectivity of newlyhatched larvae in total，but the selectivity was affected by nitrogen at 2 h after infestation and the proportion of newlyhatched larvae on the diet with 0.92% nitrogen was 36% in total； and after injection for 48 h the number of larvae on diet with 1.16% nitrogen was higher than others Sugar content could affect the selectivity of 3rd instar larvae Nitrogen content also affected the numbers of 3rd instar larvae on the different diets， and 3rd instar larvae preferred diet with 1.53% nitrogen The 5th instar larvae liked to choose diet with high sugar (27.22%) The amount of nitrogen showed no obvious effect on choosing different nitrogen artificial diets of 5th instar larvae In total， soluble sugar plays an important role in the feeding preference of C medinalis larvae， while nitrogen only affects the activity of 3rdinstar larvae in feeding preference.

Key words: Cnaphalocrocis medinalis, feeding perference, artificial diet, nitrogen, sugar