Abstract: In order to clarify the effects of different rearing densities on the growth and development of O. sauteri nymphs, the indexes of survival rate, adult harvest rate and female-male ratio of O. sauteri nymphs at different rearing densities were evaluated in indoor constant space. The results showed that rearing density significantly affected the survival rate and adult harvest rate of O. sauteri nymphs, but had no significant effects on the female-male ratio. Among the treatments, the death rate of young nymphs was higher, especially at higher rearing density. The survival rate and adult harvest rate of nymphs presented a decreasing trend with the increase of rearing density. At lower rearing densities(100 to 400 nymphs per bottle), the nymph survival rate was 69.81%-73.38% and the adult harvest rate was 65.63%-69.63% after 10 days of rearing. While at higher rearing densities (1 500 and 2 000 nymphs per bottle), the nymph survival rates were 46.77% and 47.75% and adult harvest rates were 38.27% and 37.76% respectively after 10 days of rearing. Therefore, lower rearing density can promote the adult harvest rate of O. sauteri nymphs.