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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.