The working principle of horizontal ribbon screw mixer is : The mixer is equipped with two shafts rotating and reversed paddle screw flights . Paddle screw flights are forming into some degrees ,taking and stirring materials along axis direction and radial direction,so as to mix materials evenly in a very fast speed. Horizontal ribbon screw mixer’s feature and performance are that the speed from the gearreducer rotating with screw shaft and the sturcture of paddle screw flight will weaken. With the lack of gravity, there exist difference among size of particles, bulk density ,etc. The intense stirring movement will shorten the mixing time for one batch, it will be much faster and higher effectiveness. Even if materials have difference on bulk density and particle size, with the flipping and fast stirring of staggered arrangement’s paddle screw flights, we also can get a better mixing products. The horizontal ribbon screw mixer has high uniformity mixing , small residual amount and suitable for mixing more than two kinds of fertilizers and additive premixes .