Abstract: Plasmids have important role in phenotype characteristics and pathological effects of Bacillus cereus（Bc）, Bacillus thuringiensis(Bt) and Bacillus anthracis(Ba). This paper reviewed the research progress of plasmids of the three kinds of Bacillus, in which we mainly elaborated the relationship between the plasmids and the toxin production, plasmids conjugal transfer, inserted sequence, and typical plasmids. We analyzed the important role of plasmids research in public health security, biological control and transgenic technology. Finally, We prospected the direction of the plasmids research.

Key words: plasmid, Bacillus cereus, Bacillus thuringiensis, Bacillus anthracis