Abstract: In view of that the testers for determining tobacco loss from cigarette end based on a rotating box method now available are mostly manually operated,an automatic tester was designed based on Windows CE embedded operating system.It is composed of a mechanical movement system,a controlling and processing unit,a high-precision weighing unit and an input-output unit.The tester determines the tobacco loss from the ends of cigarettes for up to 5 cigarette samples simultaneously and fulfills the functions of weighing,statistical,analysis,data storage,printing,and communication.Test results showed that comparing with the imported testers of the same type,the new designed tester could shorten 27 minutes for completing a test run,and there was no significant difference between test results.The tester features high automation and efficiency,and rapid determination.