Developmental period, mummification, pupal mortality, and sex ratio of Korean strain of Aphelinus varipes F$ddot{o}$rster parasitizing the green peach aphid, Myzus persicae were studied at 20, 25, 30, and $35^{circ}C$ in controlled climate cabinets. The plastic container with a leaf disc of sweet pepper (Capsicum annuum L.) was used as experimental units. Green peach aphids at different developmental stages were reared in four different temperatures and presented to A. varipes for 12 hours. A female adult of A. varipes was allowed to parasitize for 12 hours in each plastic petri dish. The periods from egg to adult of A. varipes were 18.3 days, 14.7 days, 10.4 days, and 9.3 days at $20^{circ}C$, $25^{circ}C$, $30^{circ}C$, and $35^{circ}C$, respectively. The pupal mortalities of A. varipes were 0%, 1.5%, 2.8%, and 10.2% at $20^{circ}C$, $25^{circ}C$, $30^{circ}C$, and $35^{circ}C$, respectively. The mummifications of A. varipes were significantly different in all developmental stages of the aphid. The mummification of A. varipes parasitizing green peach aphid was the highest at 1st and 2nd in $20^{circ}C$ and $25^{circ}C$, but the highest at 3rd (84.4-85.0%) in $30^{circ}C$ and $35^{circ}C$. The host feedings of A. varipes were $20^{circ}C$ (12.5%), $25^{circ}C$ (17.3%), $30^{circ}C$ (16%), and $35^{circ}C$ (10.9%), respectively. The sex ratios of A. varipes female were $20^{circ}C$ (49%), $25^{circ}C$ (46%), $30^{circ}C$ (69%), and $35^{circ}C$ (60%), respectively.