Abstract: Based on the mixing principle, the authors analyze the agitation mechanism of a new-type punched agitator,and announce that such punched agitators with simple structure not only can improve the mixing through intensifying the eddy spread,but also reduce the power consumption by diminishing the projection area in the direction which the paddles round.Through the application research in the water system ,it is obviously shown that such punched agitators have the characteristics of simple structure,high efficiency and lower power consumption, and it can be widely applied .