The results of screen test showed that 3% of Fenoxycarb was the best to control Phodococcus sariuoni Borchsenius,with which the prevention effect reached 86%.Effect of 1000 times of Imidacloprid was 77% to 79.7%.The plant originated chemical did not achieve ideal effect,such as Bitterhullvine,Nicotine,Azadirachtin.3% of Fenoxycarb can take the place of poisonous and high residue chemicals like Advathion,which is currently used for controlling of Phodococcus sariuoni Borchsenius.It can be widespread in Xining for controlling scales with less harm.