Carbon-free basic dry vibration mix was prepared using middle grade magnesia and fused magnesia as main starting materials, metasilicate replacing phenolic resin as binder, adding a certain amount of medium and low temperature intensifiers. Effects of binder, grain composition, and additives on basic dry vibration mix for tundish were studied, and the bonding mechanism was also analyzed. The results show that: (1) when using metasilicate as binder, the higher strength can be acquired; (2) the suitable grain composition is q=0.48, the critical granularity is 5 or 3 mm, the fines addition is 10%–20% (mass percent); (3) the strength and corrosion resistance of the basic dry vibration mix can be improved by the melting compound of metasilicate and additives; (4) with temperature rising, the bonding type in dry vibration mix changes from cohere bonding to reaction bonding, and then to ceramic bonding at last.