Abstract: The working principle of cigarette weight measuring and controlling system in cigarette making and tipping machine combination was introduced, and the working principles, merits and demerits of microwave measuring probe and nuclear scanning probe were compared. The standard errors of sample weights deviated from target weight was regarded as a criterion for evaluating the veracity of measuring probe. The practical test results showed that the veracity of microwave measuring probe was comparable or slightly superior to that of nuclear scanning.