① twin horizontal shafted mixers : The agitating process not only happens on the radial direction ,but also happens on the axis directions . The main mixing zone locates in the circumferential direction of the mixing body, during the whole mixing process , the mixing capacity is maximum. Thus ,we can take full advantage of the agitating space , get the best mixing effects when bone materials ,cements and water are mixed at the rate of circumference movement. ② Single horizontal shafted mixer : The principle of single horizontal shafted mixer is similar to the vertical self-falling mixer . Its mixing shaft’s rotating function is to improve the concrete to some height,then make materials fall down freely, completing mixing process for one time.