Abstract: Identification of 951 samples collected from different store ecotope shows that 747 samples of them have the Bacillus. 1138 strains of the Bacillus were isolated from 951 samples,including 143 strains of B.t (12.5%), 11 strains of B,s (0.97%) and 984 strains ofother Bacilli (86.40%). 158 strains of thuringionsin, phosphalipase C and parasporalcrystals were separated from 1138 store strains. Among 158 strains,there were 143 strainsof B. t, 5 strains of B. s and 10 strains of other Bacilli. In total of 158 toxin strains, 120strains could kill insect. It is showed that relativity exist between insecticidal toxin andtoxicity in the strains. But insecticidal toxins of different Bacillus are different in insecticidal range and toxicity.

Key words: Store ecotope, Bacillus, Insecticidal toxin, Insecticidal toxicity, Changbai Mountains, litter mixing effect, litter decomposition, early frost period, benthic macroinvertebrate