In order to find the lead compounds with excellent biological activity,the utilization ways of rosin were further developed.In this paper,dehydroabietyl-2-aminobenzothiazole compounds were syn-thesized by reacting with SOCl2 to dehydroabietyl-2-aminobenzothiazole compounds.The structure of the compound was confirmed by nuclear magnetic resonance spectroscopy(NMR),infrared spectrosco-py(IR),and high resolution mass spectrum(HR-MS).The bactericidal activity of 6 compounds a-gainst 8 pathogens such as Gibberellus triticum,tomato early blight and peanut brown spot was tested by AGAR dilution method.All the target compounds had certain bactericidal activity against the tested bacteria,and the bactericidal activity against Gibberellum triticum was generally good.Compounds 4a and 4b showed the best bactericidal activity against Gibberellum triticum,reaching 66.7%and 71.8%,respectively.