Abstract: Kytorhinus immixtus Motschulsky was the major pests of seed of Caragana. Effects of 2 insecticides in different concentrations to control K. immixtus were compared. It showed that insect fruit rate of 50% Malathion EC was（5.47±0.11） % after 900 times spraying, compared with（10.67 ±0.31）% in CK. Control effect of different kinds of insecticides with different concentrations were also good, with insect fruit rate（8.93±0.18）% after 50% Malathion EC 1200 times and 50% Sumithion EC 500 times. Insect fruit rate of 50% Malathion EC 900 times and 50% Sumithion EC 500 times was（10.00 ±0.23）%.Using 50% Malathion EC 900~1200 times and 50% Sumithion EC 500 times together could be recommended to control K.immixtus in production.