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各种苏云金芽胞杆菌在杀虫毒力和杀虫谱上有很大差异。研究表明，这种特异性的杀虫毒力与存在于苏云金芽胞杆菌内的转座因子有密切关系，不同类型的转座因子其转座方式各异，总的来说可分为３种，即同源重组、转座重组和特异位点重组。这种转座过程的发生往往伴随着苏云金芽胞杆菌杀虫晶体蛋白的变异，这在基因工程菌的构建和杀虫多样性的研究上有着重要意义。
A variety of Bacillus thuringiensis insecticidal toxicity and insecticidal spectrum are very different. Studies have shown that this specific insecticidal toxicity and the presence of Bacillus thuringiensis transposable elements are closely related to different types of transposable elements transposable in different ways, in general can be divided into three kinds, Namely homologous recombination, transposon recombination and specific site recombination. The transposon process is often accompanied by the variation of Bacillus thuringiensis insecticidal crystal proteins, which is of great significance in the construction of genetic engineering bacteria and insecticidal diversity.