Abstract: In order to test and evaluate the scan precision of microwave scanning and control precision of microwave weight control system in PROTOS 70 cigarette maker, the weight control system was evaluated by statistical methods according to the structure and working principle of weight control system in PROTOS cigarette maker, namely, the scan precision of the scanning head was examined by calculating short-term deviation from target weight, the control precision of weight control system was examined by long-term standard deviation and extreme difference of group weight, and the performance of weight control system was evaluated by examining the functioning of waste rejecting.This method is easy, simple, and able to evaluate the performance of control system comprehensively and objectively.