Abstract: Compatibilities between Beauveria bassiana (strain XJBb3005) and 5 commonly used botanical pesticides was studied. Impacts of the pesticides on the spore germination, mycelia growth and sporulation of B. bassianawere tested. The results showed that matrine and celastrus angulatus were more compatible with B. bassiana than the others, with their inhibition rates on the conidial germination of 37.66% and 33.14%, respectively, when low sub-lethal concentrations of the pesticides were applied. With the commonly applied dosage, sub-lethal or low sub-lethal concentrations, these two botanical pesticides showed a slight inhibition on the mycelial growth of the bacterium. Under a low sub-lethal concentration, celastrus angulatus exerted a slight inhibition, while matrine promoted the sporulationto a certain extent. In all 3 concentrations, pyrethrin exhibited a slight inhibition on the mycelial growth, somewhat promoted the sporulation, but severely inhibited the conidial germination. On the other hand, azadirachtin and veratrine were found incompatible with B. bassiana.