Some experiments were conducted in the laboratory to develope possible artificial diets for -rearing the aphidivorous coccinellid beetle (Harmonia axyridis p.) The basic diet (BD) contained agar, casein, glucose, cholesterol, ascorbic acid, vitamin B mixture, sorbic acid, mcthyl-p-hydroxybenzoate, chlorophenicol and distilled water. To this diets were added drone pupae dry powder (DR), defatted silkworm pupae powder(DSP), honey and yeast. Development periods of the beetle took longer, and the hatching rate was lower when they were fed on artificial diets than they were supplied with fresh aphids. Number of eggs laid, pupation and adult emergence rate of beetle were similar when fed on BD+DP, or on fresh aphids, but those figures decreased when they were fed on BD+DP+DSP+yeast. The Iongevity of the 1st generation adults, fed on artificial diets from the first instar larvae on, was ,longer than that of those on fresh aphids, but that of their first offsprings rapidly decreased. Body and/or ovary weight of adults was lighter, when they were fed on artificial diets, than that of those on fresh aphids. Ovarioles developed much more slowly in those adults reared on artificial diets than those on fresh aphids.